General Phil Breedlove, Nato’s Supreme Allied Commander for Europe and head of the US European Command, said weapons such as barrel bombs have no military value to hit precise targets and instead serve to terrorise those living in rebel-held territories.
He told the Senate Armed Services Committee that the destruction formed part of a deliberate strategy to “get them on the road” and “make them a problem for someone else”.
“Russia’s entry into the fight in Syria has exacerbated the problem, changing the dynamic in the air and on the ground,” General Breedlove told politicians including Senator John McCain.
“Despite public pronouncements to the contrary, Russia has done little to counter Daesh (Isis) but done a great deal to bolster the Assad regime and its allies.
“Together Russia and the Assad regime are deliberately weaponising migration in an attempt to overwhelm European structures and break European resolve.
“All genuinely constructive efforts to end the war are welcome but actions must speak louder than words.”
Vladimir Putin launched Russia’s intervention in Syria at the request of Bashar al-Assad in September and the Kremlin’s air strikes have supported a significant regime advance against the opposition.
In pictures: Russian air strikes in Syria
In pictures: Russian air strikes in Syria
Syrian boys cry following Russian air strikes on the rebel-held Fardous neighbourhood of the northern embattled Syrian city of Aleppo
Russian defense ministry spokesman Major General Igor Konashenkov speaks to the media in Moscow, Russia. Konashenkov strongly warned the United States against striking Syrian government forces and issued a thinly-veiled threat to use Russian air defense assets to protect them
Syrians wait to receive treatment at a hospital following Russian air strikes on the rebel-held Fardous neighbourhood of the northern embattled Syrian city of Alepp
Russian Deputy Defense Minister Anatoly Antonov speaks at a briefing in the Defense Ministry in Moscow, Russia. Antonov said the Russian air strikes in Syria have killed about 35,000 militants, including about 2,700 residents of Russia
Jameel Mustafa Habboush, receives oxygen from civil defence volunteers, known as the white helmets, as they rescue him from under the rubble of a building following Russian air strikes on the rebel-held Fardous neighbourhood of the northern embattled Syrian city of Aleppo
Civil defence members rest amidst rubble in a site hit by what activists said were airstrikes carried out by the Russian air force in the town of Douma, eastern Ghouta in Damascus, Syria
A girl carrying a baby inspects damage in a site hit by what activists said were airstrikes carried out by the Russian air force in the town of Douma, eastern Ghouta in Damascus, Syria
Civilians and civil defence members look for survivors at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria
Civilians and civil defence members carry an injured woman on a stretcher at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria
Volunteers from Syria Civil Defence, also known as the White Helmets, help civilians after Russia carried out its first airstrikes in Syria
The aftermath of Russian airstrike in Talbiseh, Syria
Smoke billows from buildings in Talbiseh, in Homs province, western Syria, after airstrikes by Russian warplanes
Russian Air Forces carry out an air strike in the ISIS controlled Al-Raqqah Governorate. Russia's KAB-500s bombs completely destroy the Liwa al-Haqq command unit
Caspian Flotilla of the Russian Navy firing Kalibr cruise missiles against remote Isis targets in Syria
Â© TASS/ITAR-TASS Photo/Corbis
Russia claimed it hit eight Isis targets, including a "terrorist HQ and co-ordination centre" that was completely destroyed
A video grab taken from the footage made available on the Russian Defence Ministry's official website, purporting to show an airstrike in Syria
A release from the Russian defence ministry purportedly showing targets in Syria being hit
Russia launched air strikes in war-torn Syria, its first military engagement outside the former Soviet Union since the occupation of Afghanistan in 1979. Russian warplanes carried out strikes in three Syrian provinces along with regime aircraft as Putin seeks to steal US President Barack Obama's thunder by pushing a rival plan to defeat Isis militants in Syria
Caspian Flotilla of the Russian Navy firing Kalibr cruise missiles against remote Isis targets in Syria, a thousand kilometres away. The targets include ammunition factories, ammunition and fuel depots, command centres, and training camps
Â© TASS/ITAR-TASS Photo/Corbis
Moscow has insisted Isis is its main target but opposition groups and Western leaders have alleged its strikes have mainly targeted areas controlled by the opposition, killing countless civilians.
The Russian President helped broker the continuing ceasefire between regime forces, “moderate” opposition groups and their respective backers but Isis, Jabhat al-Nusra and other UN-designated terrorist groups were not party to the truce and fighting continues, albeit on a much smaller scale.
In the run-up to the “temporary cessation of hostilities” that started on Saturday, Russian and Syrian forces were accused of deliberately targeting hospitals and civilian infrastructure in possible war crimes.
In a report released on Thursday, Amnesty International claimed it has “compelling evidence” of at least six deliberate attacks on medical facilities in the Aleppo governorate over the past 12 weeks.
The regime’s advance sparked a new flood of refugees into Turkey as asylum seekers continued to arrive on Greek islands at roughly 10 times the rate they were during the same period in 2015, which was a record-breaking year.
General Breedlove repeated concerns that Isis can exploit the crisis to send its fighters into Europe, as it did before November’s Paris attacks.
He said that the flow of migrants crossing the Aegean Sea was “masking the movements of criminals, terrorists and foreign fighters”.
“Within this mix, Isil (Isis)or Daesh is spreading like a cancer, taking advantage of paths of least resistance, threatening European nations and our own with terrorist attacks,” he added on Tuesday.
The US Army in Europe (USAREUR) is working with American agencies and international allies to track returning fighters and share intelligence on suspected extremists.
In his written evidence to the US committee, General Breedlove said public opposition to the welcoming of refugees in some European countries could also pose a security risk.
“Local nationalists opposed to a large-scale influx of foreigners could become increasingly violent, building on the small number of attacks against migrant and refugee housing observed to date,” he noted.
The UN’s former High Commissioner for Refugees, António Guterres, has urged countries not to use the threat of terrorism to turn their back on the hundreds of thousands of asylum seekers continuing to flee conflict and persecution.
“It is not the refugee outflows that cause terrorism, it is terrorism, tyranny and war that create refugees,” he said.
“It is clear that the Daesh (Isis) strategy is not only to set Europeans against refugees, but within Europe, to set citizen against citizen within communities, community against community within countries, and country against country in the Union.”
More than 133,000 migrants have arrived in Europe by sea so far this year, according to the UNHCR, with at least 400 drowning in the attempt.