I'm just talking general military power. Geography makes all out conflict unlikely. Kazakhstan and Mongolia are kinda in the way.
Hypothetical scenario where Kazakhstan allows China it's land and air space... Russia get drubbed.
China knows it's behind America, hence the big % R&D budget allocation. Official goal is to be equal power by 2050. Has had that high percentage towards R&D for 3 decades now. Russia has been the opposite of late. Gearing up for a war requires kit and training, not R&D.
Only China has been smashing Russia when it comes to new kit. I don't know the ins and outs of which is better but when it comes to 5th gen planes I can say without doubt China has a lot more. Basically the same down the list of all high price military kit. China is producing more at a time when they're not trying to. With a substantially smaller % budget allocation (still apx 3x in size I believe)
A China that was anticipating or looking for a conflict will pump out an insane amount of kit. There's no reason to believe a country that already manufactures apx 25% of consumer goods, has a billion people, an economy not much smaller than America and a massive PPP advantage can't produce kit in American Army sized numbers in an insanely short time. It's not going to be as good, but to beat Russia it doesn't need to be.
*disclaimer* Sounds like I'm sucking CCP Military dick here... only looks that way because I'm comparing them to Russia.
China military isn't good. Similar to Russia they bolster numbers with crappy old kit, though not the same extent. Also militarily incompetent historically with no evidence this is being focused on. China just has the other qualities: money, manufacturing and population. Combine $ with high R&D% allocation and you have a tech.