If any, Korea gets any military technology it's from from Russia and probably even a little more from China. However, these powers know that giving anything more than slightly harmful technology to a beligerent nation destablizes the region. I don't think they want that.
So far, it's simply been boasts, sabre ratling, and unsubstantiated claims. Scientists are still unable to determine if NK's "nuke test" was a sub megaton nuclear blast or just NK setting off all the conventional stuff they could get their hands on as a ruse.
How far does NK expect to get in a war with soldiers who already don't have enough to eat?
ROX