I think it's worth noting that the USSR (intentionally) did a heck of a lot to negate that and build a (more or less Russian less christian influence) national

I think it's worth noting that the USSR (intentionally) did a heck of a lot to negate that and build a (more or less Russian less christian influence) national identity by re-settling minority groups that didn't like them. This kind of worked, somewhat, and not for reasons they were anticipating. Turns out that forcibly resettling people doesn't make them like you but it does make them tolerate each other a little bit better because they all now have one thing in common: shared adversity under the USSR. However, in the places where it didn't work it created bigger problems. Places (Chechnya) that could have been clean breakaway republics didn't do so because they had a ethnic Russian minority holding them in and in cases where those nations did break you have the Russian group trying to lean politically into Russia and the non-Russian group leaning away and that causes its own problems (Georgia, Ukrainian breakaway provinces, etc) Russia is far more unified across ethnic lines than people give it credit for. It's not going to pull a Yugoslavia and erupt into genocide as soon as Putin croaks. That said, it's nowhere near as unified as the US (where you can basically count on any immigrant group becoming functionally "American" in 2 generations).