Keeping a ~80 yr old complex mechanical device rolling is generally a non-trivial exercise.
That Russia participated in crushing the original NAZIs is a Good Thing.
Did we build and send Russia any of those T34 tanks as part of lend lease against the Germans in WW2?
These guys manage to keep several running.
https://www.americanheritagemuseum.org/
I want to go back for one of the reenactment events. They probably have the best on-display collection of armor in the Western hemisphere. And it’s very artfully done. Dig around, there are a lot of pics buried away on their site.