Three days into its bombing campaign in Syria, Russia on Friday at last targeted Islamic State positions, striking at the defacto capital of the terror organization and at least one other site.

The Russian strikes at the Islamic State came after two days in which its aircraft attacked locations belonging to other fighting groups opposed to Syrian President Bashar Assad, including CIA-supported rebels, sparking calls for the Obama administration to do something to protect fighters it had trained and equipped.

But President Barack Obama made clear that the U.S. had no plans to deepen its role in Syria.

"We're not going to make Syria into a proxy war between the United States and Russia," Obama said at a White House press conference. "That would be bad strategy on our part."