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The problem is jim this will end in some sort of Military action, it is far too late for diplomacy and as we have seen with others, like Hitler, they do not listen to reason ever.
However it starts South Korea will cop it, I think thye have known this for a very long time. China may get angry but they have tied their economy to the West far too much now so i think a lot would be rhetoric and what was done after TJU and his cronies were removed. Clearly the best situation all round is to remove the KJU regime and then allow China to rebuild NK as a buffer state (just not another rogue one). I'm sure diplomats could come up with something similar that the Chinese would agree behind close doors whilst sounding off their 'disapproval'