This is a rather tardy re-post of something I wrote for the Diplomat in the wake of the Iran deal in late July.
I still think my basic argument is correct. North Korea is far more isolated than Iran, so it needs the weapons a lot more. It also spent a far larger proportionate share of GDP to develop those weapons. So there’s no way they’d give them up without impossible concessions like the withdrawal of USFK or the end of multiparty elections in South Korea.