The world deserves a little ass-kissing.
Put yourself in Medvedev's shoes. You have only offensive weapons, you can't afford another arms race. With an effective defensive weapon system in Europe, your capabilities are nil in the missile arena.
With respect to Iran, I'm sure it's within Obama's character to bomb the hell out of Iranian nuke facilities. Bombing wasn't a problem for Clinton in Serbia and Sudan.
Wait to see if the baby's clean before you throw him out with the bath water.