Talk to any Syrian you meet on the Syrian-Turkish border these days, and in less than five minutes the conversation is likely to turn to Da’ash—the Arabic acronym for the rebel organization known as the Islamic State of Iraq and Greater Syria, or ISIS.
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Since its appearance last April, ISIS has changed the course of the Syrian war. It has forced the mainstream Syrian opposition to fight on two fronts. It has obstructed aid getting into Syria, and news getting out. And by gaining power, it has forced the US government and its European allies to rethink their strategy of intermittent support to the moderate opposition and rhetoric calling for the ouster of Syrian president Bashar al-Assad...