REUTERS

"We ... don't respond to our partners in such a rude way. But everything has its limits. We may respond," Putin told an audience at the Valdai International Discussion Club in southern Russia on Thursday, Reuters said.

Read alsoRussian, Syrian strikes in Syria demand war crimes probe - KerryHe made the comments after accusing the U.S.-led coalition of violating a ceasefire agreement by bombing Syrian government forces in September.

The Moscow Times reported that Putin said Russia and the U.S. could have cooperated in Syria, but "forces in Washington" derailed this outcome, in favor of working with extremists in pursuit of various geopolitical aims. 

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"Extremists are clever," Putin warned, "but by flirting with them, you'll end up on the losing side."