What historical reasons would justify invading and killing people who don't want to be part of russia? As for buffer states, by attacking Ukraine they pushed F

What historical reasons would justify invading and killing people who don't want to be part of russia? As for buffer states, by attacking Ukraine they pushed Finland into NATO which the führer does not seem to mind. So we can easily call bullshit on this trope. As for access to Black Sea, just look at the map. russia has plenty of access to it.