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Petro Poroshenko, has vowed not to give up control of Crimea to Russia in his first address as President of Ukraine.
The billionaire “Chocolate King” was inaugurated on Saturday and set out his plans for quelling violence in the east of the country, where hundreds have died in bloody clashes between the army and pro-Russian rebels.
In his first address, Mr Poroshenko promised amnesty “for those who do not have blood on their hands” and called for dialogue with “peaceful citizens” in the east.
“I am calling on everyone who has taken arms in their hands — please lay down your arms,” he said, according to a translator.
The new President, who favours closer ties with Europe over Russia, met with Vladimir Putin in France during commemorations for the 70th anniversary on D-Day on Friday.
He had already received a friendly welcome from Western leaders and vowed to work with the Russian President to “end the bloodshed” in eastern Ukraine.
Despite the talks, the Ukrainian President vowed not to accept Russia's annexation of Crimea.
“Crimea was, is and will be Ukrainian. There will be no trade-off,” he said.
Ukraine's President-elect Petro Poroshenko (left) and Russian President Vladimir Putin during an international D-Day commemoration ceremony (Getty Images) Russia annexed the peninsula in march and the subsequent secession referendum was regarded as illegitimate by Kiev and some Western countries.
Mr Putin has denied allegations that Russia has fomented the rebellion in the east, and he insisted that the Government needs to speak directly to rebels.
Mr Poroshenko also called for early regional elections and promised increased powers for local governments but rejected calls for the federalisation of Ukraine.
He insisted that Ukrainian would remain the only state language but promised “new opportunities for the Russian language,” without elaborating on specifics.
The tycoon was elected last month with 55 per cent of the vote but concerns about the legitimacy of the election, in which some polling stations were blocked by different factions, have been raised.
As the first official replacement of ousted leader Viktor Yanukovych , he faces a mammoth task quelling a separatist insurgency in eastern Ukraine and tackling the country’s corruption-plagued economy.
Harsh statements on the pro-Russian rebels, branding them “terrorists” and promising retribution for the deaths of Government soldiers, came before bloody assaults on the insurgent s that have killed hundreds.
The task is a far cry from the manufacturing business that made the 48-year-old’s estimated $1.6 billion (£950 million) fortune.
He started his chocolate manufacturing business by importing cocoa beans into the Soviet Union in 1991 and eventually started Roshen, the foundation of a business empire that now includes ship-building and one of the country's most influential TV stations.
Unlike many other Ukrainian billionaires, Mr Poroshenko did not make his money in murky post-Soviet privatisations, boosting his reputation as a “good tycoon”.
His political career began in 1998 and he went on to hold several positions in the former President’s Party of Regions but threw his weight behind 2004’s anti-corruption Orange Revolution.
Mr Poroshenko faced allegations of corruption himself when he stepped down as head of national security amid rumours he had used his influence to benefit another tycoon.
He later returned to serve as Foreign Minister, and briefly as economics minister after Mr Yanukovych came to power in 2010 and surprised the public last year by allying himself early with the pro-European Maidan protest movement in Kiev that caused his former leader’s downfall.
Clashes in eastern UkraineShow all 126 1 /126Clashes in eastern Ukraine Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukraine 'Azov' batallion soldiers capture pro-Russian activists after taking control over city of Mariupol in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Kiev Pro-Ukrainian supporters stand in front of the Russian embassy during a protest in Kiev
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Clashes in eastern Ukraine Ukraine crisis: Kiev Activists of Maidan self-defense and Right Sector ultra-nationalist organization attend a commemoration ceremony devoted for Ukrainian soldiers killed when a military cargo plane was shot down
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk An armed Ukrainian soldier looks around while guarding at a checkpoint not far of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk An Orthodox priest holds a service during a funeral ceremony in front of the local administration building in Kramatorsk for Viktor Gagulin, a Pro-Russian supporter, who was killed during an anti terrorist operation, Kramatorsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Awaiting of pro-Russian separatists is ongoing at the government building seized by Russian supporters in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Odessa A woman bearing flowers during the rally to mourn for victims of clashes in Odessa, outside Moscow's Kremlin
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Clashes in eastern Ukraine Ukraine crisis: Odessa Pro-Russian activists mourn during the funeral of Vyacheslav Markin, the deputy of the city regional council and leader of the pro-Russian opposition, who perished during a clash between pro-Russian and pro-Ukrainian activists
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian militants escort a blindfolded man outside the regional state building they seized
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian Cossacks eat a dinner outside the regional administration building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers stand guard at a Ukrainian checkpoint near the eastern town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk At least three people were killed and several were injured in clashes between Ukrainian forces and pro-Russian separatists in the eastern city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian military helicopter lands near a Ukrainian checkpoint near the town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian military helicopter lands at a checkpoint which troops seized in the early morning in the village of Andreevka, 7 kms from the centre of the southern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A Ukrainian soldier looks on at a Ukrainian checkpoint near the eastern town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Soldiers guard a checkpoint 25 kilometers from the city of Slavyansk. Militants in Slavyansk are keeping dozens of hostages, including seven European military observers, who were detained in the city while on a verification mission under the Organisation of Security and Cooperation in Europe (OSCE)
Clashes in eastern Ukraine Ukraine crisis: Slavyansk A masked Ukrainian soldier takes position at a checkpoint which troops seized in the early morning in the village of Andreevka, 7 kms from the centre of the southern Ukrainian city of Slavyansk. Ukraine's military lost two helicopters and two servicemen in a deadly offensive launched just before dawn against pro-Russian rebels holding the flashpoint town of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters try to destroy a Ukraine national flag outside the regional prosecutor's office in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian separatists seize the Prosecution Office in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers stand near a tank at a checkpoint near the south eastern Ukrainain city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Ukrainian soldiers guard a roadblock along the highway near Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Armed pro-Russian militia attack the regional police building of Lugansk. Fresh violence erupted in eastern Ukraine after Moscow hit back at "Iron Curtain"-style Western sanctions
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Clashes in eastern Ukraine Ukraine crisis: Lugansk A resident walks through a barricaded area around the security services building. The pro-Russian activists have taken control of the state administration building and the police station
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Clashes in eastern Ukraine Ukraine crisis: Lugansk A pro-Russian activist stands guard outside the security services building. The area around the building has become a barricaded camp occupied by the pro-Russians
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk An armed pro-Russian activist stands guard at a checkpoint. Fresh violence has erupted in eastern Ukraine as thousands of pro-Russian protesters stormed key buildings
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Clashes in eastern Ukraine Ukraine crisis: Kiev Members of the protest group 'Self Defense of Maidan' stand on a barricade as they prepare to stop ultra-nationalist activists from marching through Independence Square in Kiev
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Clashes in eastern Ukraine Ukraine crisis: Kiev Pro-Ukrainian activists draw a giant map of Ukraine in front of the Parliament building, marking territories which could be lost as a result of the armed separatists' activity
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian activist gets medical attention after a clash with pro-government activists during a rally and march Donetsk. Several people were injured when the pro-Russian activists attacked a pro-government march
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists clash with pro-government supporters during a rally and march in Donetsk. Several people were injured when the pro-Russian activists attacked a pro-government march
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester walks in front of riot police during a pro-Ukraine rally in the eastern city of Donetsk. Several people were wounded when what appeared to be stun grenades exploded during a rally in support of Ukrainian unity in the eastern, separatist-held city
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Ukrainian supporters attending a rally in Donetsk. Around 1,000 people took part in a march for supporting of a Single Ukraine and were attacked by pro-Russian protesters
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Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russian armed man poses for a photograph with a child as he stands guard outside a regional administration building seized in the night by pro-Russian separatists
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Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russian armed man holds his weapon in front of the seized town administration building in Kostyantynivka Armed pro-Russian separatists who took control of the police headquarters in the east Ukrainian town of Kostyantynivka have also seized the town administration building
Clashes in eastern Ukraine Ukraine crisis: Kostyantynivka A pro-Russia armed man aims his rifle in front of the seized city council building in Kostyantynivka
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian Ukrainian presidential candidate Oleg Tsarev (2-L) of the 'Party of Regions' party is accompanied by security personnel as he arrives to speak to journalists during a press briefing in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk A man reacts near a coffin containing the body of man killed in a gunfight, during a funeral ceremony in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Foreign military observers are escorted by pro-Russian militants to attend a press conference in city hall, of Slovyansk, eastern Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Slovyansk An armed pro-Russian protestor gestures as he stands guard on a checkpoint near Krasnyi Liman, in the Donetsk area
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A Ukrainian soldier smokes his cigarette in front of an armoured personnel carrier at a checkpoint in the village of Malinivka, east of Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russian activists walk past a anti-US and EU banner near the occupied Security Service building in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A Ukrainian security force officer is deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Ukrainian security force officers are deployed at a checkpoint set on fire and left by pro-Russian separatists near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian masked gunman seen during his duty on a street in the center of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian masked gunman patrols a street in the center of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters attend their rally near of a barricade in front of the occupied regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk An woman holds a Russian flag as she sits next to an elderly women inside a compound created by barricades which surround the Donetsk Regional Administration Building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Pro Russia militia carry a casket bearing Pavel Pavelko (42) one of three pro Russia militiamen killed in a shooting by unknown gunmen at a checkpoint, during his funeral procession in Alexandrovska village near Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Supporters of the Communist Party of Ukraine meet near the monument of former Soviet leader Vladimir Lenin in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk A masked man in military fatigues brings a blindfolded Irma Krat, arrested and held by pro-Russian protestors before her meeting with journalists near of occupied police station in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian activists are demanding broader autonomy from Kiev and closer ties to Russia and continue to occupy government, police and other administrative buildings in eastern Ukrainian cities, in defiance of an ultimatum by the Ukrainian government to lay down their weapons
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Russia, the United States, the European Union and Ukraine had agreed on steps to de-escalate the crisis in Ukraine during talks in Geneva, Switzerland
Clashes in eastern Ukraine Ukraine crisis: Luhansk Valeriy Bolotov (R) new people's governor of Luhansk, speaks to the media after he was pronounced the "people's governor" inside the Ukrainian regional office of the Security Service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk An orthodox priest sprinkles a holy water over a group of people during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Bodies of men killed in a gunfight are seen in coffins during a funeral ceremony in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk An activist shows ammunition near burned out vehicles in front of a pro-Russian blockade near Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A masked man guards the entrance of the Security Service building occupied by pro-Russian activists during a rally in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Soviet army veteran Yuri stands outside a regional government building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Defiant Pro-Russian supporters react during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A tearful pro-Russian supportes during the singing of the Russian national hymn during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Donetsk A Soviet flag is seen on a barricade outside a regional government building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slaviansk Pro-Russian armed men walk past activists hanging up a "Donetsk Republic" flag outside the mayor's office in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A man in military fatigues hugs a woman and a child during a rally in front of the Security Service building occupied by pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Armed Pro-Russian man poses for a photo with local children next to barricades in front of city hall in Slovyansk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk The seperatist leader of the eastern Ukrainian city of Slavyansk, Vyacheslav Ponomaryov, holds up the pictures of two pro-Russia militants killed the day before in a gunbattle with unidentified attackers, as he holds a press conference in Slavyansk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukrainian Christian worshipers carry crosses as they march around the regional government building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Luhansk People rest under a tent next to barricades at the Ukrainian regional office of the Security Service in Luhansk
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Clashes in eastern Ukraine Ukraine crisis: Slavyansk A masked man holds a gun as as other armed people stand near tanks in Slaviansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk An Orthodox icon is displayed on barricades in front of a city parliament in Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Men wearing military fatigues ride on an armoured personnel carrier (APC) in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Armed men wearing military fatigues gather by Armoured Personnel Carriers (APC) as they stand guard outside the regional state building seized by pro-Russian separatists in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Masked pro-Russian gunmen attack a photojournalist near combat vehicles flying a Russian flag, in downtown of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slavyansk Men wearing military fatigues sit by a Russian flag and a white flag reading "People's volunteer corps of Donetsk" as they ride on an armoured personnel carrier (APC) in the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk Ukrainian soldiers clash with pro-Russia protesters in a field near Kramatorsk, in eastern Ukraine
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk Ukrainian General Genady Krutov (C) talks to journalists in front of an Ukrainian airbase in Kramatorsk
Clashes in eastern Ukraine Ukraine crisis: Luhansk A woman wearing a national flower crown looks back as she attends a pro-Ukrainian rally in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Ukrainian soldiers stand guard near a military helicopter, near the Izyum city in Kharkiv area
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Pro-Russia activists throw stones as they storm the regional police building in the eastern Ukrainian city of Horlivka (Gorlovka), near Donetsk
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Pro-Russian men storm a police station in the eastern Ukrainian town of Horlivka
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Masked pro-Russian men attack British photojournalist Frederick Paxton during the mass storming of a police station in the eastern Ukrainian town of Horlivka
Clashes in eastern Ukraine Ukraine crisis: Horlivka (Gorlovka), near Donetsk Ukrainian police try to stop pro-Russia activists from storming the regional police building in the eastern Ukrainian city of Horlivka (Gorlovka), near Donetsk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian fighter guards a barricade bearing the Russian flag on the road leading to the eastern Ukrainian city of Slavyansk
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Clashes in eastern Ukraine Ukraine crisis: Slovyansk Armed pro-Russia protesters prepare for the battle with Ukrainian police special team on the outskirts the eastern Ukrainian city of Slavyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russian activists escort a man (unseen) who they say is a provocateur outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Pro-Russia supporters surround a man who they say is a provocateur (C) outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk Armed pro-Russian supporters carry an Eastern Orthodox icon of Mary Magdalene outside the secret service building in the eastern Ukrainian city of Lugansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk Pro-Russian activists occupy the police station carrying riot shields as people watch on, in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Kramatorsk, near Slovyansk The interior minister overnight reported an attack on a police in the city of Kramatorsk, close to the city of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian gunman stands guard at a seized police station in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Slovyansk A pro-Russian gunman carries a mattress in a seized police station in the eastern Ukraine town of Slovyansk
Clashes in eastern Ukraine Ukraine crisis: Lugansk A pro-Russian supporter flashes the 'V'-sign during a rally in front of the security service building occupied by Pro-Russian activists in Lugansk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian supporters clash with supporters of Single Ukraine in downtown Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Luhansk An effigy depicting Ukrainian politician and presidential candidate Yulia Tymoshenko is hanged on a advertisement board in front of the offices of the SBU state security service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk Pro-Russian protesters set a barbed wire on a barricade outside the SBU state security service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk A masked pro-Russian activist stands in front of barricades at the Ukrainian regional office of the Security Service in Luhansk
Clashes in eastern Ukraine Ukraine crisis: Luhansk Pro-Russian separatists reinforced barricades around the state security building in the eastern Ukrainian city of Luhansk and called on President Vladimir Putin for help after the government warned it could use force to restore order
Clashes in eastern Ukraine Ukraine crisis: Donetsk A Pro-Russian activist wears a hand-made mask behind a barricade in front of the regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters hold placards reading 'Freedom for detained heroes!' during a rally near the district court in Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Policemen leave their position from the regional administration building in eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters attend a rally near the district court in Kharkiv. Meanwhile, Russia rejected accusations that it was massing troops for an invasion of Ukraine and accused the West of making 'baseless' claims and waging an anti-Russian campaign
Clashes in eastern Ukraine Ukraine crisis: Kharkiv A view of the interior of the Kharkiv regional state administration chancery after being destroyed by pro-Russian protesters. Ukrainian policemen were injured as a result of an operation to free the administration building from pro-Russian separatists. Ukraine's acting president said on April 8 he would treat Russian separatists who have seized buildings in the east of the country as "terrorists" who will be prosecuted with the full force of the law
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters throw stones at an Interior Ministry bus near the regional administration building in Kharkiv. Ukrainian police cleared pro-Moscow protesters from a regional administration building in a lightning night-time operation, but others held out in two more eastern cities in what Kiev says is a Russian-led plan to dismember the country. Shots were fired, a grenade thrown and 70 people detained as officers ended the occupation in the city of Kharkiv during an 18 minute "anti-terrorism" action
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Armed men in masks, representing Ukrainian special forces, stand guard outside the regional administration building in Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters burn tires near of a regional administration building after police cleared it in Kharkiv. Protesters are demanding a referendum on the status of the Kharkiv region, similar to the recently held referendum in Crimea
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian activists hold red flags with the communist hammer and sickle and the soviet "USSR" initals during a rally at the regional administration building in the eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters (L) clash with activists (R) supporting the territorial integrity of Ukraine as Interior Ministry members (C) attempt to break them apart during rallies in the eastern city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Kharkiv Pro-Russian protesters and police officers surround a group of around fifteen ultra-nationalist Right Sector group members (C) during a rally in Kharkiv. Several hundred pro-Russian protesters surrounded the group of ultra-nationalists and forced them to march down a steep hill on their knees in what appeared to be a humiliation ritual that drew no police response during the rally in eastern Ukrainian city of Kharkiv
Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester holds a placard bearing a crossed out "Nato" during a rally in the eastern Ukrainian city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters wave Russian flags during their rally in downtown Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists guard a barricade set at the Ukrainian regional Security Service building on the eastern city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Ukraine's embattled prime minister accused Russia of trying to "dismember" his country by plotting seizures of government buildings in eastern regions that are seeking to break away from Kiev
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists outside the Ukrainian regional Security Service building on the eastern city of Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Protesters are calling for former President Yanukovych to return to Ukraine and to hold a referendum on the status of the Donetsk and Lugansk regions, similar to the recently held referendum in Crimea
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters stand next to a barricade in front of the occupied regional administration building in Donetsk. According to reports, pro-Russian demonstrators stormed the administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Protesters set up a barricade inside an occupied regional administration building in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russia protester sets on fire an effigy depicting Stepan Bandera, one of the founders of the Organization of Ukrainian Nationalists, during a rally in Donetsk
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian masked activist waves a Russian national flag in front of the regional administration building in Donetsk, where a large group of people surged into the provincial government building and smashed windows. A gathering of several hundred, many of them waving Russian flags, then listened to speeches delivered from a balcony emblazoned with a banner reading a "Donetsk Republic"
Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists hold a huge Russian national flag in front of the regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists hold a rally in front of Ukraine's regional security service of Ukraine in Lugansk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian supporters clash with members of the riot police as they storm the regional administration building
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian activists evacuate a wounded following clashes with anti-riot forces after storming the Regional Security Service of Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters clash with police as they try to occupy a regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Around 100 pro-Russian protesters stormed the regional government building in the eastern Ukrainian city of Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk People clash with police at the regional administration building in Donetsk, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian protesters attend a rally in Odessa, Ukraine
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Clashes in eastern Ukraine Ukraine crisis: Donetsk A pro-Russian protester waves a Russian flag behind policemen near the regional government building in Donetsk
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Clashes in eastern Ukraine Ukraine crisis: Donetsk Pro-Russian supporters clash with members of the riot police as they storm the regional administration building in the eastern Ukrainian city of Donetsk
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He then allied with a potential rival, former boxing champion Vitali Klitschko, and endorsed him for Kiev mayor as Mr Klitschko supported him for president.
Mr Poroshenko supports signing an association agreement with the European Union, but has spoken against holding a vote on whether Ukraine should seek Nato membership.
Relations with Moscow should be good but equal and should not undermine Ukrainians' desire for closer ties with the European Union, he says.
For now, his priority will be putting a stop to the violence in the east that has killed more than 200 people in recent weeks, according to Government estimates.
Ukraine's cash-strapped Government, desperate to receive the full $17 billion (£10 billion) loan package promised by the International Monetary Fund, will have to undertake serious constitutional reforms early in his tenure as President.
Mr Poroshenko also faces a major hurdle in encouraging Parliament to agree to hold elections this year instead of in 2017 as scheduled.
If he fails, he could face the same challenges as the Orange Revolution government, which took two years to hold parliamentary elections.
Additional reporting by AP
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