It is possible for both of these things to be true at the same time:
1) Russia has totally legitimate national interests and security concerns, and yes the West went badly wrong during and after the fall of the USSR in not sufficiently understanding and assisting these;
2) Russia's present conduct is totally outrageous and indefensible, and what happened previously is absolutely no excuse - the rest of the world is totally entitled to react appropriately, and that includes its neighbours pursuing whatever makes them feel most secure.
Did number one really occur though to a dramatic degree? I mean, ensuring that each European countries like Poland, Hungary a d the Baltics would have the protection of NATO to avoid what's happening in Ukraine is even in twenty-twenty hindsight a completely valid, Justified, and War risk reducing move. If anything the West was too timid in not extending such an agreement to Ukraine, which of course had it been accomplished would have avoided this entire bloody invasion.
I also don't recall that America's celebrations over the fall of Communism in Russia being of a particularly in your face Style.
I think America's far larger failure was that we didn't encourage Russian democracy, and the insofar as we did encourage Western systems and connections in and with Russia, we largely did so to the detriment of the Russian public and Russian institutions.
I'm not suggesting the US and its allies bear sole blame for Russia's current course - the Russian people and corrupt Russian leadership and institutions hold the lead there. But in hindsight, we didn't help, and did a lot of damage on the way to not helping.
