ok let's agree to disagree. In summary there are two strategy options we are talking about, ie
In the scenario that Russia is danger of collapsing, you either:
a) Support Russia, covertly if necessary, so that the collapse does not happen;
b) Do nothing, and if Russia collapses, take full advantage of the situation by grabbing resources/land if it is in the national interest.
Then you would choose a) and I would choose b).
Option A is far better. Russia is structurally locked in a competition over Ukraine... forever....
Option B means chaos and war on China's borders, which will inevitably spill over in all sorts of ways.
The US will support proxies to bleed China
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Resources can be purchased. And remember that seaborne resource imports are usually the cheapest option because overland transport is so expensive.
As for land, China already has lot of empty land in Inner Mongolia and NorthEast China.
And this land has a better climate than Russian lands.