I can really relate to a lot of the things said in your post and I feel the same very often. I’m not from Russia, but from a different eastern european country. I also have dual-citizenship. Yet, I feel that people like us are in a very unique situation, because it does not really matter, where we go, we won’t fit anyway in the nationalist picture.
After finishing my Abitur here, I wanted to try out something and I moved to the country of my parents to go to uni there. I was never part of the same team here (being german), but really quickly I found out, that it’s the same on the other side. There I was just the german guy. Although I wouldn’t say, that I show it off in anyway. I don’t even have an accent in both languages.
I’m happy for you, that you found a place, where you feel welcomed and not judged.
Funny, since I also had a similar experience with my grandad. We talked a bit about starting the work life with my little brother and we talked about the difficulties of finding junior work in some fields (graduating out of school and needing five years of experience type shit) and my grandpa just laughed. He told us about being assigned to a shipyard at 18. Then we had to laugh, because both that system and the shipyard no longer exist without my grandad really understanding that fact…