Putin-Obama meeting

I think this is a brilliant play by Putin. If Obama meets him, there is an implicit acceptance of Russia's seizure of the Crimea, and the eastern part of Ukraine. Putin's offer to work with Obama to destroy ISIS is perfect. If we say yes, and between the two countries were are successful, which we should be, when the smoke clears, Assad is still in control of Syria unless Obama can make a deal that following the destruction of ISIS, Assad is replaced by a strong government representative of the people. This is a "wish". The problem is what becomes of the rebels that Washington is supporting to reduce or remove Assad from office.
On the other hand, let say that Obama refuses to meet with Putin, this will not prevent Putin from sending more troops and supplies into Syria to eliminate ISIS--it would be a big commitment, but the prize would be Assad in power, and Syria as a Moscow satellite.
Anybody have alternative ideas? send comments to me at jfharrington76@gmail.com