I guess that conspiracy theory isn't convenient in Europe right now since there's so much dependence on military aid from the US to keep the proxy war going. Saying that the US is in cahoots with Russia might get people wondering why Europe is bending over backwards for the US so much.

It's not something that is circulated in mainstream propaganda at all, but I've personally heard this point made by common people here in Italy who still drink propaganda but are starting to struggle with the contradictions.