Secretary of State Hillary Clinton says the US would need international support, including from Russia, for any military action in Syria.

Clinton says UN and international support made possible last year's intervention in Libya.  She says Russia and China stand in the way of an international coalition against the government of Assad.

Clinton told Danish students in Copenhagen that the US hasn't given up on persuading Moscow to get tougher on Assad.

But she stopped short of saying a military response was necessary. She said a larger civil war could make things worse and morph into a proxy war that draws in Iran and other regional powers. [AP]