But first, the Russians must put down their ego, accept the "new" reality that Russia is no longer a military superpower capable of taking the US head-on like the Soviet Union, acknowledge China's new position on the world stage as an influential, sovereign superpower, and acknowledge China as a comparable, if not superior, military peer to Russia.
Only then, China can sell weapons and equipment to Russia in order to help rebuilding and modernizing their military.
Otherwise, any notion of the above, alongside any substantial China-Russia military cooperation and integration into the future would be empty talk. Because as long as the Russians still holds the attitude that "Russia is still the Soviet Union" and "Russia is still the big brother of China like in the 1950s", then nothing between Beijing and Moscow can be accomplished.
I don't think any Russian leaders of importance that have heads so far inside their asses exist anymore, not after the war started.
There used to be these people, and one must guess that at least some of them are serving the west to deliberately sabotage the ties and Russia's only hope, they're really of the same stock as the "whites" who stooped to the most horrific and brutal of measures during the Russian revolution which would make even Japanazis and SS soldiers balk, just to preserve their own privilege at the expense of everyone else.
Russia by and by large, including Putin, acknowledges their junior status vs China. What they might differ on is how they consider their capability to independently fight the west.
In past joint military exercises, Russian forces has fought in joint commands with the smaller Chinese forces acting as command formation. Similarly, during joint maritime patrol, it is more often than not clearly visible which one is the command and information center of the formation.
Pro west oligarch use arguments such as Russian indigenization, false racist tropes, misinformation and the similar to downplay the benefits of Chinese support, but now thanks to the war and the West's own reaction, they have no wealth, no power and no support.