Didn't the agreement reported between the U.S. and Russia on ridding Syria of its chemical weapons happen fast? Faster than anyone could have expected. Perhaps faster than Assad expected.
Of course, we don't know what's in the agreement, or in any side agreements. Do the U.S. and Russia have congruent interests here of a high order? In Russia's case: Do they fear their own Jihadis seizing these weapons and moving them back to Russia?
Has Russia taken over the Syrian bargaining position? Will the Assad government be required to comply? This also suggests, but is it true: Iran is in agreement with the Russian position? But...we'll see.