Beijing allowing once-taboo debate on regime's collapse

North Korea's nuclear antics have rattled its alliance with China to the point that Beijing is allowing the previously unthinkable to be discussed: Is it time to prepare for the renegade regime's collapse? While China's official goal is to bring Washington and Pyongyang to the negotiating table, it is permitting once-taboo debate on contingencies in case war breaks out in the nation across its north-east border.
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