What would happen if the U.S and Russia forces to disarm China? Is China too strong, or can it be done?

Russia is in China's back pocket at least until the US is brought to its knees.

Then Russia will rue the day they teemed up with China

China would refuse to submit

and

neither the U.S. nor Russia would be willing to do what it takes

- very expensive in lives, in money, and in "political currency"

to force the issue by initiating a major war.

Nobody wins. China will no longer cower to Western powers