

It’s far more likely that China will take the East back while new Russia is in turmoil. Japan may decide it’s time to retrieve the Kuriles and Sakhalin, too. And Siberia is ripe for independence, too. A broken up Russia would be better for the world imho. Obligatory: Fuck Russia. With a cactus. No lube…
I’m good with anything that neuters Russia. They are a curse on the world, as they are now. In your scenario, China gains back it’s old possessions whilst learning that invading ones neighbours only results in bad things, so that’s an extra bonus for the world imo.