alt Hacker News> BTW, "China ends up in either nominal or practical control of almost all of [Russia]" strikes me as so unlikely as to not be worth thinking about.
Who does, then? There doesn't seem to be any internal power in position to gracefully take power when Putin inevitably proves mortal; whatever the power scramble looks like, it's going to take external funding (and thus external obligations) to secure it, which leaves whoever's providing that funding in effective control. And even if the US and/or Europe decide to try to buy one horse, China clearly is willing and able to buy a whole lot of them; just statistically they probably end up with it, no?
Russians decided that the tsar would be overthrown in 1917, that the Bolsheviks would take power, that Lenin would be replace by Stalin, Krushchev, . . . , Yeltsin, Putin.
The US, Britain, France and Japan actually invaded Russia (circa 1918) to try to influence the outcome of a transition of power without success.
None of the transitions I described depended on which leader or which faction had funding from outside Russia. I expect Russian self-determination to continue. Nationalism is a very potent force in most countries, Russians seem more nationalistic than average, and the Russian ethnicity is firm in control of the country, which increases stability and nationalism.
Just because Russia has declined in influence relative to the great powers doesn't mean it will break up or stop exercising self-determination.