NK has been a headache for China for some time now. Sanctions aside, they made it clear to Dim Kim that if he pressed the button, he would have to face the US alone. That would not fit into Kim's scheme at all, him counting on China's support and now they threaten to up and leave him. At the same time, China also made it clear that if the US launched anything resembling an attack, then China would very much side with NK.
It isn't about any saviour of the world, it's about pragmatic politics. It is in China's best interest to have both sides call back their war hawks.
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