Remember China is the one which back genocidal Khmer Rouge for a long time because they want to check Viet Nam.
They will pay for this sorry mess. They have been pushing around everybody in the neighborhood to get along with their idea. Then turn around and say that since nobody objects, there is no reason China pushes its agenda. In the mean time, Chia Head got his hands in Chicom's balls, and twist them everytime Chicom hesitates.
They value N. Korea more as a useful buffer than a toxic waste.
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Their value of N. Korea as a useful buffer trumps the risk of N. Korea as a toxic waste