For the past 2½ years, the US and its allies have been deeply reluctant to become engaged in the Syrian civil war. Over the past few days, however, the mood in the Obama administration has clearly shifted. In the aftermath of an apparent chemical weapons attack on the eastern suburbs of Damascus, the US is clearly contemplating military action. Nothing, as yet is guaranteed. Instead, as Mr Obama and his allies contemplate the next steps, there are three broad questions they will be considering.
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