You started well, but then the train got derailed...
Russia has no need for Eastern Europe (they have enough land and resources, why saddle yourself with hostile population?), as long as the said Easter Europe is not threatening them with NATO bases/missiles (US has repeatedly shown that they do not hesitate to use their muscle if they think they can get away with it, so Russia's paranoia is not entirely unfounded).
Even if Russia somehow took over Eastern Europe (most likely way: they learn from US how to do soft 'regime change'), they have no chance against China (China is just so much bigger and better organized; the population's mentality also matters a lot). China and Russia are rather complementary, there is not reason for confrontation between them.
But you are correct, what US is doing is really totally stupid ... although it seems designed by Netanyahu, not Putin.
If China cannot get oil from the middle east what happens to China and China-Russia relations? I didn't say there would be hostilities just Russia would become potentially the more dominant partner.
If NATO expansion is the reason for the war in Ukraine (not imperialism) then why has the war not stopped now we know Ukraine will never join NATO?
> Russia has no need for Eastern Europe
They sure do like to sell to them.
> Easter Europe is not threatening them with NATO bases/missiles
This never made much sense. Attacking a NATO buffer pre-emptively, brining your forces out and closer to existing NATO weapons, is basically putting you in the same situation with less resources. The issue is not about weapons "threatening". ICBMs can reach anywhere and smaller munitions from local seaboards (subs). This idea that NATO is somehow threatening by proximity is not credible. The answer to it would not be to rush headlong into a conflict to bring those forces to bear and bring your border to theirs anyway.
It looks more like the Ukraine conflict has been about securing resources, testing capabilities, and demographics (tied to capabilities). Russia wanted more resources to sell to partners and wanted to test the (declining) capability of it's own forces.