Just bluff, relax, all parties have too much to lose. Sure Kim Jong Il is a crazy ************, but he still has basic human instincs: we are small and poor, they are really big and rich, we won't win. Yes they have China on their side (partially, well it's their best friend compared to the rest of the world), but China and the US are way too interwined at the moment to attack eachother.
Still, in a very very freaky and disturbing way, I can't wait for this to actually happen. Yes I'm wierd, and stupid.