The Group of Seven industrialised nations condemned the alleged chemical attack in eastern Ghouta in Syria on April 7 and backed "proportionate" efforts by the United States, Britain and France to stop the future use of such weapons.
Russian foreign ministry spokeswoman Maria Zakharova hit back, calling the accusation "very surprising" and saying that Russia had supported the inspection. Washington and its allies launched a massive missile strike against Syria on the same day that the team of OPCW experts was expected to arrive in Syria.
"It was about a limited, targeted and effective strike that sought to alleviate the humanitarian suffering of the Syrian people by degrading the Syrian regime's chemical weapons capability and deterring their use".
Ken Ward, US ambassador to the OPCW, claimed on Monday that the Russians had already visited the site and "may have tampered with it".
U.S. officials have raised concerns that Russian Federation, the Syrian government's ally, might have tampered with the site.
Increasing regional jitters, Syrian anti-aircraft defenses shot down missiles fired at the air base of Shayrat in Homs province late on Monday and at another base northeast of the capital, Damascus, Syrian state television and pro-Iranian Hezbollah media said.
OPCW director general Ahmet Uzumcu said his nine-strong, all-volunteer team had reached Damascus, but so far "the team has not yet deployed to Douma".
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It is now under Syrian and Russian military control. Syria, Iran and Russian Federation blamed Israel for that attack.
The reported attack led to Western airstrikes against the Syrian government over the weekend.
It included a visit to the main hospital to which the victims of the alleged chemical attack where taken.
They said: "This response was limited, proportionate and necessary - and taken only after exhausting every possible diplomatic option to uphold the worldwide norm against the use of chemical weapons".
At a meeting in Luxembourg, the 28 European Union foreign ministers endorsed the missile strikes and considered steps to deepen Assad's isolation.
"We have not done this because President Trump asked us to, we have done it because we believed it was the right thing to do, and we are not alone. And we have published the legal basis for this action", the British premier said.
Mr Corbyn - who repeated his assertion that the action was "legally questionable" - faced jeers from Tory MPs after telling Mrs May she was "accountable to this Parliament, not to the whims of the USA president".