generally i don't think that nuclear war is a threat here, nuking an enemy whos just as intent on nuking u isn't going to end well, north korea has nothing to gain from nuking america, we also have a very dedicated patriot missile defense system, and a new one code named thaad is on the way, in this very unlikely event, northkorea would have to place its payload in a very logical location, but even if washingtons crippled, the u.s. still has the girth to throw off an invasion from anyone due to secretly placed command centers around the country. im an american my self, and i don't like war, but studying its possibilities is quite interesting, i wouldn't worry about korea, kim jong ill is in declining state of health, he won't start something with us, he loves his country too much, either that or himself, anyways even if he does, we are quite capable of handling it either ourselves, or in alliance with nato, and the u.n.