Of course Russia has vital interests all around it: everyone does. But it doesn't follow that "therefore Russia should be allowed to annex everything around it".

Again, we know that playbook, it has played out before in Europe. Today it's Ukraine, tomorrow it's Poland, and your arguments will still be exactly the same: Russia has vital interests in Poland, Russia has occupied Poland before, Poland is outgunned, and why would we care about Poland, really?

And then it's Germany, at which point, again, nothing has changed. Britain and France might use their nuclear deterrence when it's their turn, but if they listened to you, they'd probably say "do we want to end humanity just because we don't like Russia to rule over us? Surely not, humanity is too important to be destroyed over Russia's vital interest to annex whatever is next to Russia" and roll over.

It would end only when Russia invades the US or China, because neither will allow it if their nuclear weapons are still available by then.