You also need to do something about your reading comprehension. I have already said that the actions of the PRC are not ‘dumb’. They are, however, neither altruistic, nor (in the case of the things that you were pointing out previously - I do admit a mistake regarding antimony, and the recent restriction on selling drones does count, even though it came very late) indicative of the PRC actively supporting Russia in the war.

Nobody is claiming PRC is being altruistic here. What I actually said was that it would not be in left interest of China to let Russia fail. Therefore, they will provide support when and where it's actually needed.

Ensuring Russia’s economic stability is likely not something that the PRC is concerned about, as that could mean an even better, even more dependent source of cheap resources.

That's something PRC is extremely concerned about because the alternative could be Balkanization of Russia, which would allow the US to start surrounding China with puppet states in the west and to cut China off from critical resources such as food and energy that they get from Russia currently.

This is literally what the war in Ukraine is all about. The US hasn't even been hiding it. Read this National Interest article as an example, it spells it out in black and white https://nationalinterest.org/feature/strategy-avoiding-two-front-war-192137

RAND also published a whole study on why the US needs to break Russia before taking on China https://www.rand.org/content/dam/rand/pubs/research_reports/RR3000/RR3063/RAND_RR3063.pdf

It's obvious that Chinese understand this as well and they see a stable Russia as a matter of their own national security. In fact, they've just openly stated this https://www.scmp.com/news/china/diplomacy/article/3316875/china-tells-eu-it-cannot-afford-russian-loss-ukraine-war-sources-say

Keeping Russia politically stable? Sure.

Long term political stability is not possible without a sound economic foundation. Surely, I don't have to explain the concept of base and superstructure...