I think Kim Ill Sung and his successors were Made in China. China controlled the north's war in Korea, so they must have installed the current dynasty of Kim Ill's.
The dilemna of a war with N. Korea is the same as during the Korean and Vietnam wars, namely that China borders the north of both countries and has rolled in large armies when their allies were losing an all out war. So today this could similarly escalate into a big war with a much larger number of crazy Asian Communists. But there is only so far they can push before they will be pushed back, and when their Made in China dictator starts talk about firing their nukes at the USA, then we will do what we must do.