Syria’s chemical weapons: The other red line

Mr Obama’s other red line—the passing of weapons of mass destruction (WMD) into the hands of jihadist terrorists—is, according to intelligence sources, in real and possibly imminent danger of being breached. According to these sources, the past few weeks has seen a flurry of nervous activity that could result in intervention of some kind but which is also giving new urgency to diplomatic efforts to end the conflict.