> They've already done it in the past numerous times - I know damn well since I come from former Czechoslovakia.
Czechoslovakia was a part of the Soviet Bloc, wasn't it? During the time of Cold War? With Soviet Union being, in effect the ruling center of the bloc and considering the rest of the Soviet countries its sphere of influence? I mean, it doesn't justify what Soviet Union did then, but what happened to Czechoslovakia couldn't have happened to France, or Sweden, or the UK.
Things are completely different now. Yes, even now, with the militaristic rhetoric on both sides rising to the Cold War-era level. There is no Soviet bloc. Russia is reduced in its ambitions to the level of a minor regional power.
As for Ukraine, it has the misfortune of sharing a border and a lot of common history with Russia; so much so that Russia still considers it its sphere of interest. With Western Europe things are completely different. Russia may have squabbles with Ukraine or perhaps even with Baltic states (unlikely, because they are members of NATO), but to conclude from that that other European countries are under the risk of Russian invasion is to misrepresent reality, I believe.