The East because they are blockaded at sea currently, if they would invade Taiwan.
And they already have huge economical leverage there.
Russia is basically falling apart. But in a dictatorship, stuff like that is only seen sudden, when it collapses.
Putin seems to be making many of the mistakes of pre 1991.
The simplest solution would be to reboot the Siberian Republic [1] as a Chinese suzerainty. Ideally after Putin dies as part of a deal to the new ascender. Maybe together with giving them personal co-ownership in some major ventures there.
> East because they are blockaded at sea currently, if they would invade Taiwan
Siberia and Outer Mongolia remain closer and thus cheaper and more-secure sources than anything coming in over ocean, which in essence means from Australia, South America or Africa.
Russia is recently bluffing a bit there, Putin had a visit for the first time recently, I think it's China related:
https://en.wikipedia.org/wiki/Kuril_Islands_dispute
China is already owning the area with investments and a lot of workers/projects there are already Chinese. Seems like Russia already lost control ( unofficially)