The regime has readied part of its arsenal:

Engineers working for the Assad regime in Syria have begun combining the two chemical precursors needed to weaponize sarin gas, an American official with knowledge of the situation tells Danger Room. International observers are now more worried than they’ve even been that the Damascus government could use its nerve agent stockpile to slaughter its own people.

Hillary Clinton, NATO and Obama have all warned the regime that there would be consequences if they use chemical weapons. David Blair tries to imagine an endgame for Assad: