I am not sure if that alone is the reason though. At this point it seems that US has little to no interest in invading NK, and they sure dont need nuclear weapons to cause some preasure on NK. They will simply starve them to death, like always. Savefty is for sure one of the main reasons to get nukes. But the potential of beeing less dependand on coal/oil as energy source is for sure another reason to push the nuclear technology in NK. just saying, there are probably many reasons. Not to mention NK might even sell that technology to other nations. Nations that would usualy not fall in the category of "trading partners" for the west. I suppose nuclear weapons as threat are not even important anymore with the Soviets out of the picture. The US has a lot of tools at their disposal which can be used to influence nations. Particularly as not even China is feeling that close to North Korea anymore. Wait a min. Didnt you agreed somewhere in the past that the US should cut down on A LOT of their military instalations all around the world to save money? Dont be so damn obtuse. Seriously. I was anyway only half serious. But you damn well know that a lot of money is spend for military equipment and companies developing military technology. For sure today a lot less compared to the Cold War. But both, the west AND east have spend much in defence and offense during the cold war. To have an nuclear arsenal and also to maintain it, is not cheap.