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NK is quite easy, really
NK is not a threat to the US or anyone.
NK belongs to one man, to the dear leader mr Kim, NK is his play garden where he has absolute power in. Nuclear bombs is his warranty they his country will not be invaded a la Iraq.
There is noway that Kim will ever attack the US or anyone else, he knows he will be defeated and he will lose his power.
The recent nuclear test is simply a way to say "dont attack me, I'm well armed", and maybe a way to extort more humanitarian help which NK desperately needs.
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