Russia and China ally as trading partners to bypass sanctions; the Chinese and Russians get so cozy that they end up building a sincere military alliance. Russia and China wonder if whether or not the US could be boycotted economically as retaliation.
Russia has an economy not too far above some South American countries. Let them team up with the Chicoms, who are also building gigantic ghost cities just to make their numbers look good.
You anticipate China putting economic sanctions on the U.S. to support Russia invading Ukraine and threatening NATO/America?
China needs their exports and only less than 3% of these go to Russia. Russia has smaller purchasing power than Italy. Meanwhile the USA is the single biggest buyer of Chinese goods. Russia is nothing to the Chinese.