"The Japanese Naval Self Defense force is enormous, well armed, and very well trained." And their giant robots are armed with the `Flying Fist of Death'.
I'm going to have to go with Japan. Seriously I hope they work it out. Mark Steyn talked about just such an event in `After America' as this triggering China calling in its markers and boy, won't we look dumb: "The check? You're handing us a .. bill? W-w-wait a second, this wasn't supposed to happen! We're no longer the world's currency reserve? We can't print cash anymore like party favors? Whoa!"