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To be honest, I've got the feeling that Trump escalated this so that he could then defuse it. But maybe I'm giving him too much credit.
I don't see any evidence of a real strategy. I see someone who painted himself into a corner, and, weirdly, it was the DPRK and ROK that gave him an off-ramp out of it. It's the opposite of how these things are supposed to work, but there here we are.
