Defeating Islamic State in Syria depends on diplomacy, not bombs

Christopher R Hill argues that only when diplomacy ends the war between Assad and the Free Syrian Army can regional forces be raised to crush the terror of Islamic State    

SYRIA is being wracked by two wars. One, between Syrian president Bashar al-Assad and rebel groups like the Free Syrian Army, can be resolved only through a diplomatic solution — precisely the kind of solution that the peace talks in Vienna, involving a wide range of world powers and regional actors, are aiming to reach.

The second, being waged by Islamic State, will require a very different approach.