More likely, Kim and Xi have been 'colluding' on a strategy seeking the maximum amount of humiliation for the US and, with the able complicity of Trump because, you know, he's Trump, they are accomplishing their goal; while Trump cancels and waffles on the summit and he has his minions like Bolton stirring up the pot, Kim is 'going the extra steps' and doing things like meeting with Moon, blowing up his nuke test site, etc., and. even though its all smoke and mirrors, to the rest of the world, Kim is coming across as the "reasonable" leader (then again, how hard is it to appear reasonable when being compared to Trump). It all optics. Kim is playing the game and, with the assistance of Xi, playing it pretty well. I don't think Kim is really worried: he gets to make Trump dance, keep his power, keep his nukes, and gives up, really, nothing...
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