I highly doubt Russia would be short of any of those platforms. Even for parts they could cannabalise some of their old stock.Honestly I would expect Russian built equipment in PLA service such as Su30/35, Kilo class and Mil 17s. China has better indigenous systems to replace them with and Russia would mainly be intending these to deter NATO rather than for the immediate fight in Ukraine.
WaPo article:
For WL-2 the Russian could have got as many as they wanted before the war started.
The only thing that makes sense to me would be something that they've recognised has unexpectedly good utility "on the job". The most obvious thing is drones for reconnaissance and targeting. We've seen a steady increase in Russian drone footage as the war has gone on.
Old fashoned heavy Soviet artillery & modern Chinese reconnaissance drones will do far more damage than a TB2 or WL-2 alone.