China is kind of a soft-ally to the States, and are essentially teddy bears when it comes to geopolitics. Russia on the other hand is not even remotely worried about blatantly violating the hegemony.

Honestly, not more. China do resist US economically and it would be important in the long run, but considering how imperialism works, resisting it militarily is a prerequisite of everything else, since if they would be not resisted, China would be soon surrounded and eventually would be squashed, just as USSR was.

Both are needed and tied to eachother, just the situation is weird that unlike the past those aren't done by a single country but two.