This is the perfect time to make it China's problem.
The thing China wants to avoid, at all costs, is hundreds of thousands of NK refugees streaming across its border (due to famine, war, etc...).
So, go to the Security Council with lots of pious talk about how sanctions need to be tightened even more, due to this latest outrage, talk about how there's huge danger from NK's nuclear activities which requires a clampdown, etc....
Put pressure on China to openly defy all of this to save themselves, or to resolve the root cause of the problem by tugging on the leash of their pet.
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