I did some googling...found this from CNN, April 26 just past:
"(North Korea) believes the only way to deter the US from attacking them, and maintaining the power of the Kim regime, is by the possession of nuclear weapons,"said Joe Bermudez, an analyst with 38 North, a North Korean monitoring group.
Bennett, the Rand analyst, said North Korea's leaders look at states like Libya and worry they'll go the way of Moammar Gadhafi if they accept US carrots in exchange for abandoning nuclear ambitions."
This opinion makes sense to me, especially in light of the latest selection of our local book club, NOTHING TO ENVY; Ordinary Lives in North Korea, by Barbara Demick. The book is assembled from a reporter's interviews with people who had escaped from North to South Korea...so drastic, I would have considered it propaganda were it not for the credentials of the reporter.
(Sigh)...does not answer your questions...I realize...