The NK have been brainwashed for the last more than four decades now and their people and military don't know any better at this point. They're paranoid to the extreme with the exception of some officiers who've seen what its like on the other side.
If they do start a war, China and Russia are not longer going to bail them out. Times have really changed and while both countries are still "allies" of NK on paper, neither are really crazy enough to risk economic or political stability for these crazies. I think NK is probably batty enough to use a nuke if they do get invaded though. Luckily they don't have that many nukes or any true ICBMs. Their current SRBMs/IRBMs really don't have the range to hit anything but countries in Asia atm.
Given that the NK civilians are starving, they'll probably rattle the saber every so often so they can keep extorting food from the rest of the world.
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