Idle speculation, but why would North Korea want nuclear bombs? And they would test one in a country that in area is slightly smaller than Mississippi?
They have much less ariable farm land than South Korea, suffer under one of the world's worst dictorships, there have been many reports of starvation, and yet they can afford a nuclear weapons program? Maybe that's the answer, to take over the rich South Korea, but then that excludes the opinions of all the neighbors.
The ruler, Kim Jong-il is a bizarre character, and his favorite 'consort' just died, which observers feared might upset him. Plus he's always been open to Chinese bribes, so why are thesestories coming out right now? Are the Chinese wagging his tail?