The vast majority of the world is celebrating the self-evident decline of US-centric unipolarity. But those of us who live here have some hard years ahead.
The Russians are probably the least likely to want liberating from what I've seen of all Europeans, but I do think a plurality of Russians would want this. Which justifies it. That said, without this invasion of Ukraine and the danger I feel it presents to my homeland (the US), I wouldn't even be bringing this up. The Russian Federation would be on their own. It's just that the leadership over there is now a danger to everyone else.
Even still - I don't see a problem with countries rescuing other countries from despotism, in principle. I eagerly include my own country in this - if a Putin-like figure arose and I was not permitted to speak out or face death, it would comfort me to know that help was coming. The terror of an oppressive regime is its inescapability.
I am a bit confused. It seems like Putin was not emboldened when Trump was president. Why do you think his second term would have been different?
Putin attacked Georgia when Bush was president. Putin attacked Ukraine when Obama was president. Putin attack Ukraine when Biden was president.
The only US president in the last 20 years that was in power when Putin didn't attack a neighboring country was Trump.