If I could just add one comment on this: I hope what can come out of it is a “cap and freeze” arrangement, and ambiguity about what “denuclearization” actually will mean.
The dark element of this story is that to settle the nuclear and the missile issue, we are going to have to give assurances to a regime that is extraordinarily distasteful. Can that bargain be sustained in the United States, in future? Boy, there are a lot of reasons to think not. I'm afraid that Professor Burton's idea—that our distaste for that government is not enough for us to not deal with the immediate danger and threat, which is the nuclear program—will at least get us over this particular hurdle and into deep negotiations and then into the “cap and freeze”.
We're going to have to swallow something very hard, then, to work with that government and hope that over time openness will be the best way of dealing with its development issues and ultimate denuclearization. Although, maybe it will be at the same time that the United States decides to denuclearize itself, that the North Koreans will be willing to do that as well.