I don't think anyone in the Chinese government would be opposed to strengthen and deepen bonds between Russia and China.
But doing so by providing military support and arms to Russia at this moment in time, is not the only option to deepen said bonds in the short, medium or long term, and the high potential costs of providing said arms and military support may not be worth the benefits.
China has finite geopolitical and geoeconomic capacity to expend -- is providing military support and arms to Russia right now , really the best use of it?
All this isn't to say that China should not provide geopolitical and geoeconomic and technological support to Russia in a general manner. However, providing military arms or explicit military support, is something else entirely.
The emphasis is on the specific point in time in question, ie, now. Both Russia and China said there wasn't any such request of that nature.
But, should such request does happen, it's worth pulling the pin out, as Russia wouldn't ask for something they don't need to achieve their goal, which perfectly lines up with that of China's. Russian security is China's first line of defense as it turns out, given the not so subtle telegraphing of Americans' hostile strategic intent and locking up significant parts of their military and economic capabilities to specific hostile focus on China. Providing weapons in case of Russian request and need is basically China's defensive offensive preemptive offshore strike of a sort, or a proxy war, to keep the active conflicts away from her own border, exact mirror of what is normal standard US practice. Economic reasons are always a distant secondary when it comes to strategic survival of a state. What exactly is the point of being rich and technologically advanced society when you are already dead and buried and long ceased to exist?
I have seen some posters here who would spout appeasenik FUD nonsense like economic factors are absolute priority over a nation's survival, as an unbreakable axiom of truth, much like what a veritable American think tank with an hegemonic axe to grind would proselytize. Not trying to jingle anybody's bells, but that line of thinking would have a sell by date of 1989. This is 2022 now. Grow up, or change your appeasenik FUD line of tactics.