Another US-Russian Syria ceasefire deal has been blown up.Whether it could have survived even with a US-Russian accord is open to doubt, given the incentives for al-Qaeda and its allies to destroy it. But the politics of the US-Russian relationship played a central role in the denouement of the second ceasefire agreement.The final blow apparently came from the Russian-Syrian side, but what provoked the decision to end the ceasefire was the first ever US strike against Syrian government forces...














