There’ve been many country-specific national advantages proposed over the years (many historically based). A great place to start is The Captain’s House Rules Expansion (I don’t find his implementation of many of the rules completely accurate, but he has some really good ideas):
https://drive.google.com/file/d/1SRDOsOwlO4Aa13cULwkWrorrXEmCmiN-/view
Specifically, there are some great Soviet ones in those rules.