The fact that you still believe that there is a difference between the Free Syrian Army and ISIS depresses me.
What happens if a Russian shoots down a US Plane and the Pilot falls into the hands of ISIS? One of a hundred bad things that could happen. The “Free Syrian” Army will vanish under Russian Pressure so the Civil War will be over. It will be Syria/Russian/Iran vs ISIS(Dash) Payback will be terrible and grim. We should be looking into Re-capturing Mosul and re-taking Iraq.