This Slavic death fest is just another chapter of the European civil wars that is eroding Western culture. The Chinese are indeed overjoyed. They now know the Russians simply do not have the conventional capability to defend Siberia and their rich, underpopulated, Far Eastern Asian/Pacific territories. If somehow their nuclear response were neutralized, China would move fast and Russia would be much smaller. Europe and the US could and would do nothing.
100%
China already has access to any natural resource they want in Siberia, they can simply buy it from a friendly seller, and they don't need it to house or feed their people. Japan will be the the Target of Chinese expansion (for good reason), then South Korea.
China won't touch Russia until China is Administering several Protectorates that USED TO BE US States, and the Philippines.