Quick solution to the Kim Jong Un problem. Neither China nor Russia like the USA influence in the region, South Korea and Japan being the USA's biggest allies. If China and Russia join the USA to remove little fatso, by force if necessary, then reunite Korea. At this point, USA remove their weapons and influence in Korea. China and Russia happy, lasting peace in Korea.
I assume that you're expecting a unified Korea to have a democatic government. Somehow or other, I can't quite see the Chinese leaders rushing to restore democracy anywhere in the world, as the message it would send to its own citizens might get them rather worried.
Further, can you really imagine that the twerp in the Whitehouse would actually agree to the reduction of US influence anywhere in the world?
As Little Fatso has proved he has the capability to hit Guam, known as the biggest aircraft carrier in the world, The Donald may have to do something. What would China prefer, US influence, or a slightly larger Korean democracy that will be tied up for many years in integrating the North.
China would prefer the third option of the North behaving itself. Failing that, taking over the whole Korean region and removing the North South animosity. This probably conflicts with the US preference of the South taking over the region and removal of the trouble causing government in the North. But there's nowt wrong with fantasy propositions. They're fun to speculate.
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