It's not as if the USA was a saint either, you could even argue that they've been more so than Russia.
A true Armor Wars could be interesting, but now that you mention the Russian, i don't think they should only have Crimson Dynamo, i think it would be a perfect oportunity to also feature Titanium Man and Radioactive Man, all three as part of the
As for other villains i would like to see besides the ones already mentioned, definitelly Black Knight
Either one of these designs could work, hell, maybe we could even have both, one could be Nathan Garret, in the comics he was a criminal who later repents in his death, and the other could be Dane Whitman, a long time Avengers member.
Maybe they could start as a tag team of mercenaries or rogues, and as Garret has a change of heart in death, Dane Whitman helps Iron Man and possibly joins the Avengers later on.