Proxy and ally, gotta distinguish between those two on some level here, I would say; if only to make a point about the differences between mutual benefit and a predatory relationship. Anti-imperialist people in Russia are aligned with anti-imperialist people in China for good material reasons, but are still distinct peoples, cultures, and interests outside of that allegiance to the same anti-imperialist fight. Ukraine has no good reason to be allying with the US and throwing its people to their deaths, in order to fight Russia; its an act of destroying itself upon Russia in a way that only benefits its masters, not itself. The two have tried to broker peace before and had the west sabotage it.

Unless you want to argue allyship between western neo-nazis and Ukrainian neo-nazis, then I guess you could say there's some kind of allying? But clearly, then, not the kind of allying a person would want to be endorsing.