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Let’s face it: We don’t really know why North Korea decided to test a nuclear weapon last week, why it has suddenly declared the Korean War armistice of 1953 null and void, why it has launched several test missiles and is preparing to launch others. It could be because the North Koreans are dissatisfied with the state of negotiations with Washington and want more concessions or more attention. It could be that the regime — which is no longer capable of delivering regular food supplies, or even reliable electricity, to its people — wanted to strengthen its grip on power. It could be something else altogether. Personally, I favor another scenario, equally speculative: Perhaps the North Koreans have stepped up their war rhetoric, and their war preparations, because China wants them to do so. I cannot prove that this is the case — just as no one else can prove any of their theories about North Korea — but I can look at the evidence, which is as follows: