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Indeed. But also, rockets are just plain difficult to get right. It's daft to assume no progress will be made but right now there just isn't much of a threat.
I'm not sure what you're basing that on. Rockets are indeed difficult, and the North Koreans have become good at them through sustained development effort spanning decades.
They are a poor country, but they spend approx. 25% of their GDP on defence, and much of that is on their nuclear weapons programs. To put it in context, they are spending a similar (adjusted) amount to what France was spending on nuclear weapons in the 1960's, a time when France fielded multiple successful nuclear weapons systems, (including missiles).
I really would urge you to examine any beliefs that, because something is difficult, the North Koreans are incapable of doing it. This blog post is a good read, if you haven't seen it already. The author is also worth following on Twitter on matters of nuclear proliferation, and general atomic trivia.
Indeed. But also, rockets are just plain difficult to get right. It's daft to assume no progress will be made but right now there just isn't much of a threat.