Or because someone was afraid of Russia.
That's actually funny, Yes, that is what we are talking about.
No one wants the return of the Russian empire. Ukraine is fighting this war to not have to end up back in some form of a respawned Russian empire. All the eastern European former Soviet and Soviet satellite states that joined NATO did so as the best guarantee agains the return of the Russian empire.
Finland and Sweden eventually joined NATO, because it is becoming increasingly clear that non-NATO membership now equates ending up holding the bucket, and downright inviting Russian military aggression. Russia is a direct danger to any state outside NATO – by Russian choice and design.
Which is why Ukraine is pushing so hard for Ukranian NATO membership – not that it is getting it so far...
NATO is the only readily available tool that as actual potential to
deter Russia at this point. (There are other, more, things that can do it, but they take more time and effort – time being in short supply in particular.)
THIS is why European security analysts are trying to calculate when – should Russia be able to actually wrap up the Ukraine war again to its satisfaction – Russia might be able to attack further neighbors, be that three, five, seven, ten years or whatever.
All that matters now is credible deterrence of Russia – how to keep Russia
out or our countries, how to keep Russia from trying to rebuild some kind of wildly quixotic, nightmarish empire.
This Russian war is perverse, as the Russian dreams of empire are perverse.