Don't think for a second that Russia and China have a alliance, o that they have the same goals. The Xi and Putin friendship is just as much worth as the Hitler / Stalin pact was in 1940. China is just waiting for the right moment to profit from this mess the Russians are in now. They want their peice of Siberia back that the Russians took, and wont mind if its a bit more than that. All they need is the right reason to step into action. And the Russians wont be able to do anything about it. They can't even handle Ukraine, let alone the chinese army.
The last time I read about the chinese gold production, it was rated at 4,400t yearly. And they dont sell anything of that. So it can be assumed that they have by far the biggest gold reserve of all countries - may be even 40,000t or more.