Russian soldiers captured by Ukrainian forces crossed the border accidentally, a source from Russia's Defence Ministry has reportedly claimed.
Ukrainian security services released video footage yesterday of 10 Russian paratroopers it claimed were captured by government forces while fighting alongside pro-Moscow rebels in the east of the country.
The footage, which is likely to fuel allegations from Kiev and its Western allies of Russian involvement in the war, appeared on the day the Russian and Ukrainian leaders have met for talks in the Belarussian capital to try to end the conflict.
Russian President Vladimir Putin and Ukraine's Petro Poroshenko reportedly greeted each other with a handshake at the start of talks, marking the first time the two presidents have met face-to-face since June.
According to the Novosti news agency, a defence military source insisted that the cross-border incursion was a mistake.
“The soldiers really did participate in a patrol of a section of the Russian-Ukrainian border, crossed it by accident on an unmarked section, and as far as we understand showed no resistance to the armed forces of Ukraine when they were detained,” the source said.
One of them, who identified himself as Ivan Milchakov, listed his personal details, including the name of the paratroop regiment he said is based in the Russian town of Kostroma.
“I did not see where we crossed the border. They just told us we were going on a 70km march over three days,” he said.
“Everything is different here, not like they show it on television. We've come as cannon fodder,” he said in the video.
In pictures: The Ukraine crisis
In pictures: The Ukraine crisis
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Ukrainian soldiers from the 'Azov' battalion guard their base in Mariupol, Donetsk
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Children were transferred from orphanages in Donetsk and Makeyevka to escape the fighting between the Ukrainian army and pro-Russian separatists
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Ukrainian servicemen captured by pro-Russian separatists sit on the ground as they are assigned to clean a street in Snizhne in the Donetsk region
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A view inside the Youth Culture Centre destroyed by pro-Russian separatists in Donetsk
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A woman holds a portrait of her dead son as she speaks during a rally in front of Ukrainian President Petro Poroshenko's office in Kiev
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A boy ascends the stairs of a bomb shelter after the shelling in the Petrovskiy district in Donetsk
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A medic looks at thirty coffins prepared for the funerals of pro-Russian rebels killed during heavy fighting at Donetsk airport, outside a Donetsk morgue
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Relatives mourn near the coffin of Mark Zverev, a taxi driver shot dead during clashes at the Donetsk airport between Ukrainian troops and the pro-Russian rebels, during his funeral in the village of Grabari on the outskirts of Donetsk
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Medical workers carry a wounded pro-Russian militant on a stretcher after armed clashes occured between pro-Russian gunmen and Ukrainian troops in Slavyansk
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A member of a newly-formed pro-Russian armed group called the Russian Orthodox Army mans a barricade near Donetsk airport
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Black smoke rises from a shot down Ukrainian Army helicopter outside Slovyansk
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A woman is overcome with emotion as she looks at blood stains and damage around a wrecked truck of supporters of the self-proclaimed 'Donetsk People's Republic' on road leading to the Donetsk International Airport
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A local man looks at damage near a wrecked truck of supporters of the self-proclaimed 'Donetsk People's Republic' on road leading to the Donetsk International Airport
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A bloodstained icon of Jesus is seen among blood soaked shattered glass atop a wrecked truck near the Donetsk airport
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A family member attends a funeral for Olga Prokhorenko (60) who was killed by shrapnel after Ukrainian government forces shelled their location, during the funeral in Slovyansk
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A woman reacts after seeing the lifeless body of a man killed by shrapnel following a shelling from Ukrainian government forces in Slovyansk
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Pro-Russian militants take position on the roof of the international airport of the eastern Ukrainian city of Donetsk
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A woman embraces a pro-Russian separatist from the "East" battalion during a rally in the eastern city of Donetsk
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A Ukrainian helicopter Mi-24 gunship fires its cannons against rebels at the main terminal building of Donetsk international airport
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A pro-Russian gunman changes his position near the airport, outside Donetsk
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A pro-Russian gunman aims his weapon near the airport, outside Donetsk. Ukraine's military launched air strikes against separatists who had taken over the airport in the eastern capital of Donetsk in what appeared to be the most visible operation of the Ukrainian troops since they started a crackdown on insurgents
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Pro-Russians ride on a truck in Donetsk. A convoy of an armored personnel carrier and seven trucks carrying several hundred heavily armed men drove through central Donetsk and gunmen got out of the trucks, stood to attention and gave shots in the air in jubilation as a crowd of several thousand supporters cheered them and chanted: "Heroes!"
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An elderly woman leans against the chest of a pro-Russian gunman in Lenin square in Donetsk
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Pro-Russian militants guard a psychiatric hospital after shell explosions during the fighting between pro-Russian militants and the Ukrainian army, in Semyonovka village, outside Slavyansk
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Ukrainian troops stand guard at a checkpoint on the road near the eastern city of Izum, Donetsk
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Members of the Democratic Alliance party take part in a performance in front of the French embassy in Kiev. Protesters set up a pool with the blood of animals and models of warships in a protest against French plans for the sale of two Mistral helicopter carriers to the Russian Navy
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A man carries a portrait of pro-Russian activist Vadim Hudich, who was killed in a shooting incident at the head of a funeral procession in the eastern Ukranian town of Krasnoarmeisk
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A voter is seen inside a voting booth at a polling station during the referendum on the status of Donetsk region in the eastern Ukrainian city of Donetsk
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Members of a local election commission sort ballots as they start counting votes of referendum on the status of Luhansk region in Luhansk
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Members of a local election commission empty a ballot box as they start counting votes of the referendum on the status of Donetsk region in Donetsk
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Members of a local election commission empty ballot boxes as they start counting votes after a referendum, at a polling station in Lugansk
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Local residents watch as others give first aid to a man who was shot in the leg by Ukranian militia in the village of Krasnoarmisk. Eyewitness said that Ukranian militia tried to stop the referendum voters briefly taking the City Hall of Krasnoarmisk, where unarmed pro-Russian supporters were gathering. Reportedly the Ukranian militia came out out the building and started shooting at the people, killing at least one man and leaving at least two others injured
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Members of a local election commission count votes after a referendum organized by the so-called Donetsk People's Republic members at a polling station in Donetsk
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Voters visit a polling station to take part in the referendum on the status of Donetsk
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An Armoured Personnel Carrier (APC) with a Russian flag drives through the center of Slaviansk during the day of referendum organized by the so-called Donetsk People's Republic members in Slavyansk
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A statue of Lenin is placed in front of a pro-Russian barricade on the outskirts of the eastern Ukrainian town of Slavyansk
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A feamle veteran (C) sings during 'Victory Day' celebrations in Donetsk
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People stand near the burning Mariupol police station
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Ukrainian soldiers stand guard beside an armoured personnel carrier at a checkpoint in Mariupol. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building
Another man in the footage, who gave his name as Sergeant Andrei Generalov, said: “Stop sending in our boys. Why? This is not our war. And if we weren't here, none of this would have happened. They would have sorted things out with the government themselves.”
Russia denies giving military help to the separatist rebellion in eastern Ukraine.
The 10 paratroopers have been detained with their personal documents and weapons near the small town of Amvrosiyivka in Donetsk region, the Ukrainian state security service said.
"Officially they are on military exercises in various corners of Russia. In reality they are involved in military aggression against Ukraine,“ Ukraine's Defence Minister Valeriy Heletey said in a Facebook post.
Ukrainian military spokesman Andriy Lysenko claimed the Russian men crossed into Ukrainian territory on a "special mission".
Video: Ukraine and Russia hold peace talks
Mr Lysenko said separatists were attacking the southeastern border town of Novoazovsk "at this very minute" and Ukrainian forces had destroyed 12 armoured infantry vehicles in the area.
He claimed four border guards had been killed by Russian Mi-24 helicopters, and three had been injured.
Yesterday, Ukraine's president dissolved parliament and called for elections on October 26 as his country continues to battle a pro-Russian insurgency in its eastern regions.
Prior to this, the Ukraine military said a column of Russian tanks and armoured vehicles crossed into south-eastern Ukraine, away from where most of the intense fighting has been taking place.
Meanwhile, Russia announced plans to send a second aid convoy into rebel-held eastern Ukraine, where months of fighting have left many residential buildings in ruins.
Russia’s dispatch of more than 200 aid convoys into Ukraine on Friday was denounced by the Ukrainian government as an invasion, even after they returned to Russia without incident the next day.
But Russian Foreign Minister Sergei Lavrov dismissed reports of a Russian incursion into Ukraine, describing it as ”dis-information“ by the authorities in Kiev.
Additional reporting by agencies