I don't think it's helpful debating whether past military actions were justified given the current Russian military assault on a democratic country. For starters, it's easy to judge past actions with the benefit of hindsight.
We know this current Russian action is an anti-democratic attempt to rebuild part of the Russian empire by subjugating a country of 40 million, who don't want to be oppressed, to fulfil Putin's personal ideals.
Modern Russia is pretty much a lie - people living as though they are in a democratic country when they have no freedom of expression, etc. Oligarchs are allowed to run businesses along western capitalist lines as long as they support the regime.
Yes, there is propaganda in the West too, but at least we can question what we're told and have the means to research more widely.
Maybe that's naive, but I know where I'd rather be.