How much of China can Russia take over?

The title says all. Let's say that the japanese fail to put a Meiji, or the Russians decides to focus on China earlier than OTL, how much of China can Russia annex?
 
Mongolia (both inner and outer), Manchuria and East Turkistan can all be seized given that they all border Russia.

I could see Qinghai and Gansu, and maybe even Tibet being annexed, depending on how far they can push their luck vis a vis other powers.
 
Mongolia (both inner and outer), Manchuria and East Turkistan can all be seized given that they all border Russia.

I could see Qinghai and Gansu, and maybe even Tibet being annexed, depending on how far they can push their luck vis a vis other powers.

And how much of it can be held on indefinitively, like Primorsky?
 
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