It is just a red herring. A delaying tactic.
Assad will never allow intrusive enforcement.
And he will insist on lots of conditions.
Perhaps he will request all states stop their aid to the opposition (military or otherwise), and engage the US in confidence building, ie a couple of tons out of Syria every month in exchange for the above mentioned actions. Putin, Iran, and the UN will perceive such actions to be positive and continue supporting a diplomatic solution.
Putin and Assad will twist this into an Assad wins situation. Lots of Sunnis and Kurds will die.
And at the end of the process Assad will still have lots of chemical weapons.
Obama should launch tonight whilst he still has some surprise.