Heck, even Russia right now is on the brink of getting their ass kicked across the galaxy! If they just lowered their noble white head just a little bit and sort China's military technology only just 2 years ago, they would at least be able to integrate Chinese targeting pods to their Sukhois and Migs with an ocean of cheap Beidou/INS guided 250kg class PGM's, and get a huge fleet of cheap attack drones that could have won the war already. At least before the war starts (make an order in 2019, deliver in 2020/2021, and get battle ready just before this war), they could get a couple of 075 LHD and/or 071 LPD, and/or 052D, which would have help to take Odessa in the first wave of attack already. I am pretty sure China would be happy to sell the platform to Russia integrated with Russia missiles systems
At least doing this would be able to chain China to Russia's bandwagon, giving the West an excuse to pressure China, and forces China to react aggressively to those pressures. Right now, China has the luxury of basically distancing herself from this conflict and watching from afar.