But Russia and China are not really communist. I don't understand how they can support those two governments. Karl Marx would not see either of them as true communist.

You're close. Tankies are supportive of anything that lines up with the state-sponsored propaganda they consume.

They might "think" Trump will at least bring peace, during the election as a reason to not oppose him. They might hate Bernie Sanders and Elizabeth Warren, but love particular Russian-aligned US politicians who are ten times more "problematic" or pro-empire than those ones (or other particular ones they also do extensive hand-wringing about.) It's why they all support Maduro, it's why they hate Ukraine but support Palestine, it's why they love software like Lemmy but hate software like Wikipedia, it's why they are worried about green energy in Europe which isn't "practical" but also hate Biden because he didn't support clean energy enough, and so on and so on. Their collection of anecdotes and arguments is pretty much a perfect match for the Russian disinfo machine and there is literally no other thought process I can come up with that arrives at such a specific and self-contradictory assemblage of stances.

They're just dim enough to get taken in. What proportion of them are true disinfo posters, and what proportion are genuine people who are simply dim enough to get fooled and so self-select themselves into the community, I have no idea, although I would love to be able to find out somehow.

work with Russia and China to divide up the world into their own areas of imperialistic influence.

Ahh yes, the 1984 plan for the future. Glad I'll be dead, maybe shouldn't have had kids.

you know you're from a tankie instance, right?