"Again, we are being threatened," Russia's ambassador to the US, Anatoly Antonov, said in a statement.
"We warned that such actions will not be left without consequences. All responsibility for them rests with Washington, London and Paris."
"Insulting the President of Russia is unacceptable and inadmissible," added the envoy, after President Donald Trump directly called out his Russian counterpart Vladimir Putin over his support for the Assad regime.
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