Pre-emptive, nuclear Bump dittos. Just be sure to butter 'em when they are done ( the N. Koreans, that is ). And watch out for the unhappy S. Koreans who have suddently gone mushy over their country Kuz's.
I don't know if I'd blame them... a few years into the Clinton Administration they had to realize that they had no backing. He was giving more money and support to NK than to them and showing no spine when challenged anywhere else. Seems like a pretty good reason to try to make friends in my book.
Now that Bush and the adults are running our foreign policy, I don't think SK will have any real troubles going to more aggressive relations with NK.