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Don't believe any of it currently. Kim might be arrogant, but he isn't completely stupid. Firing at South Korea, Japan, or Guatemala (US military base) would cause all hell to break loose. There's already visible tension between China and NK after all of NK's stupid mistakes and threats, so China wouldn't even be an issue. NK is by themselves in this world, they have absolutely no "true" allies. They trade with China, their current relationship isn't much stronger than ours.