Russia has warned that U.S. air strikes against militants in Syria would be a "gross violation" of international law.
A Russian foreign ministry spokesman said any such action, without the backing of the UN, would be "an act of aggression".
It comes as U.S. Secretary of State John Kerry meets Arab leaders in Saudi Arabia to try to build a coalition against Islamic State (IS) militants.
President Obama has threatened action against IS in Syria as well as Iraq.
This post was published at BBC
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