Our country is actually in a good spot in that situation, all other things being equal. Our nearest neighbors are much smaller (canada has only 37.59 million people to our 327 million) and we have a rather large abundance of natural resources. The immediate fallout would be extreme compared to our current cushy standard of living, of course, but the long run would hopefully be to our benefit.
I'm thinking a few European countries would be needing to learn how to read Cyrillic, though...
It wouldn't be good at all in the short term, but in the long term it would become business as usual disturbingly fast... especially if it resulted in any sort of ground war anywhere in the world. They'd be wanting our military to take care of that in a hurry.