The US airborne raid into Syrian territory marks the culmination of years of frustration with Damascus’s reluctance to police its own border with Iraq, the main point of entry for foreign jihadists. Since the 2003 invasion, Syria, fearing that it could be the next target for regime change, has allowed Islamic militants to cross its desert borders freely. Significantly, the village of al-Sukkari farm, which US forces raided, is just over the border from the Iraqi city of al-Qaim, which, since 2003, has been a key funnelling point for jihadists entering Iraq on the so-called rat run to the Sunni...