Whoo boy that's gonna be a tough one.  We've been digging that hole since the Korean War.  If Russia had their military bases and exercises on the Mexico border, American's would be having a fit!  But, then we can't understand why Kim's got his feathers ruffled?  Throw on to that pile the sanctions we kept putting on them, and how else would they respond.  Now we have a ticked off dictator backed into a corner building something that can punch us right in the nose.