North Korea won't nuke anybody. It's not a country run by robots. It is run by humans who understand that they are vastly dependant on other countries, and quite literally, tons of imports.
Using a bomb would undoubtedly make the UN take action (regardless of how useless most internet-debaters think it is), and if they don't send troops, they can just block all trade and completely screw them that way. Which would work.
Furthermore, America + coalition, under such circumstances, would probably go and invade or destroy the country, of which they are capable.
It's in nobodies' favour to ever drop a nuke again. The world won't stand for it.
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