China has about 10x Russia's population and from what you're saying about 10x the economy (and the economic gap is bound to increase)... So it's clear that any alliance and close relationship between Russia and China will turn out like the US and its allies, i.e. with the larger side firmly in charge.

I think at the moment China's objective has to be to maintain 'stability' in Russia. Indeed, it's clear that the West's play in the war in Ukraine is to attempt to destabilise Russia to the point that Putin is toppled, with the obvious objective to replace him him with a weak, Western-friendly (and not China-friendly) leader. Clearly China will not want that to happen.