Will Liaoning be sold to Russia when new aircraft carriers have joined the fleet?
Possible but unlikely given the costs it would involve stripping out all the Chinese weapons and systems and replacing them with Russian gear.
Such a deal will also piss the Ukrainians off no end, which is something China would not wish to do if it could avoid it.
If Russia really was to turn to China to help build them carriers, they would be far better off gettting a new built second generation Chinese carrier with EMALS, or even a nuclear supercarrier.
Alternatively, they could send the Admiral K to Dalian to get the same once over as the Liaoning, Although given the age and condition of the Russian carrier, I’m not sure it would be worthwhile.
This is most likely a similar deal to the UK RN pilots training on American carriers - to help their pilots stay proficient during their own carrier’s down time as opposed to Russia shopping for a Chinese built carrier.
Russia still wants their own shipyards to do that.