Soldato
Agree this seems like a potentially really interesting opportunity from China's point of view. They have been building up business links with Russia for some time, and a weakened Russia, especially following Putin stepping down would be a great time to build influence and expand business and trade interests in a way most beneficial to China while Russia doesn't have many other options. Especially if Russian relations with the West remain frosty.China has a problem to resolve with upper Manchuria which has been occupied by Russia for over 150 years as there's plenty of Chinese nationalists who want it back which creates a state security conundrum for Beijing.
Russia imploding allows them to take it back and Hanise it, though this is obviously itself a security problem because Russia balkanising is far more dangerous than the USSR collapsing as a bunch of ethno-states will have access to all manner of WMD's so rationally China has to make a choice between propping Moscow up or taking advantage if this is inevitable.
Russia falling apart would also allow China to fully drag Central Asia into their sphere without resistance whilst vassalising much of Russia in the process.
Getting outer manchuria 'back' would be a great prize for China alongside effective control over Kazakhstan etc...
Stabilising Russia to prevent it Balkanising could be an excuse for all sorts...
Guess the longer the Ukraine crisis goes on and the more hardened Western attitudes to Russia become the better for China...