So what is Putin trying to do?

Two weeks ago,  Obama was about to take a big hit when Congress rejected his call for Authorization for the Use of Military Force,  21st century jargon meaning declaration of war.  Then, in response to an unplanned remark by John Kerry at a news conference in Europe, Putin jumps up and sells a face saving compromise to the world.  Syria will turn its chemical weapons over to a neutral party and the US won't do missile or air strikes on Syria.  The Americans love the idea, the Administration loves the idea 'cause now they don't have to suffer Congressional defeat, Congress loves it because they don't have to be mean to Obama, the voters love it because they never wanted to get mixed up in Syria at all.  Talk about a win-win.  Everybody in America wins.
   What's in it for Putin?  Sure,  he gets a lot of favorable publicity, and gets to write an Op-Ed in the NY Times,  but  all this is kinda light weight stuff.  Old Joe Stalin would not have been impressed unless the deal brought more land under Russian sovereignty,  more countries into the Soviet block, or destroyed enemy armies in battle.  I don't see that happening here. 
  I think Putin would have done better to leave Obama hoist by his own petard (big mouth).  Had Putin done nothing, Congress would have voted down (or trash canned) the authorization for the use of military force.  That's a big hit.  Obama would have either backed off on Syria, or pressed on without Congressional approval, neither of which would have come out well for Obama.
   Far as I can see, Putin bailed Obama out of a deep deep hole.
   I wonder why.