beardedbruce - Maybe I'm wrong. Maybe the U.S. only wants to honour their treaty commitments or uphold the U.N. resolutions and ceasefire.   
I don't really know what that entails but...

somehow I have the impression that the U.S. doesn't give a shit what the U.N. has to say but will use them to mop up their messes whenever they can.

You make it sound as if they were there on behalf of the U.N.