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As I've said before, the most likely course of action leading to war in Eastern Europe is NATO launching a "pre-emptive" strike at Russia and its allies from the territory of Poland and Baltic states (and maybe Ukraine or Finland if things get really shitty).
NATO's belief in easily winning a conventional war with Russia is very well known, any public opposition to the war is extremely unlikely because of the anti-Russian sentiment in the EU and America -
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Russia is widely renown for its love of belief in feeling important. What allies of Russia, you mean Armenia? The whole confrontation of "righteous Russia" vs. "Nazi
Europe USA's vassal NATO" is manufactured from the ground up any way. I feel that Russia's current administration will fall to its own impossibility sooner or later I'm afraid, just like the good old USSR, what Europeans actually worry about, Russia being in the immediate neighborhood and all, is what happens before that, how much of the poop will spread across the borders and what are the long and short term economical effects. As we have seen, nobody in the West outside of US Republican Party cares much about Ukraine but instead do care about what happens if Russia is let to proceed doing what it wants to do for whatever reasons along the same road it has chosen with Ukraine. I'm all for economical sanctions that hurt hard, such as blocking Russia from SWIFT.
Also, if necessary, the EU countries stepping too much out of the line(potentially Hungary, Greece) need to be penalized somehow; EU can indeed do that. Say, by removing their right to vote and veto in the parliament and councils.