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China wouldn't physically stop it either nor will allow a US attack. It's main purpose of support to NK is to keep US and its allies away from China.
The Chinese objections to NK shouldn't be misunderstood to assume that the Chinese would turn their back on them any time soon. NK depended on China for 80% of its food and energy needs, so China could've easily flexed its muscle long ago to influence a desicion. Whatever's happening right now probably is going to be accepted by China in the long run.
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