US intervention in Syria underway since uprising began

The opposition's Free Syrian Army says it's no longer commited to the UN-backed peace plan. Instead, it wants foreign states to impose a no-fly zone to help oust President Assad. The rebels' decision to quit the UN-backed truce was largely motivated by the behaviour of the U.S. and its allies. That's the view of anti-war activist Don Debar, who's extensively covered civil conflicts in Arab countries.