Russia is a signatory state to the Capetown convention, if they have a Russian court order saying change of ownership, that still has to be registered on the international registry for it to be recognized. They wont get recognized as the previous owner and the international registry will not accept a Russian court document as a legal change of ownership as the binding lease contract states the only venue that matters relating to the contract will be heard is in London.
The Russians would need to apply to the London courts to recognize the Russian court order which will never happen.
That's a good one, though I doubt, China will go that far and just simply accepts the Russian court version, for "local China use", be it accepted throughout the world, or not. Hey, China did throw out / overruled the HK Basic Law, at the first opportunity they saw. China adheres only to Western "requests", when they have no other opportunity and/or it's going to cost China a significant amount of money.