"Any military actions that lead to a deterioration in the situation in Syria obviously impact the political process," deputy foreign minister Gennady Gatilov was quoted as saying by state-run RIA Novosti in Geneva.
"Such actions that were carried out against the Syrian armed forces... this is completely unacceptable, this is a breach of Syrian sovereignty," he said.
US-led warplanes on Thursday carried out a strike in the east of the country against a convoy of pro-government forces headed towards a remote coalition garrison near the border with Jordan.
In a statement, the US-led coalition said it had struck "pro-regime forces... that posed a threat to US and partner forces."
The coalition said the strike came after unsuccessful "Russian attempts to dissuade Syrian pro-regime movement" as well as "a coalition aircraft show of force, and the firing of warning shots." -- AFP