The Iraq war was wrong for a multitude of reasons, and many countries (including mine) wanted to do nothing to do with it, but one thing sets it apart very clearly from the current situation:

Iraq wasn't a war of conquest. Russia's war against Ukraine is. The US hasn't waged a war of conquest IIRC since Hawaii, it's always been foreign meddling instead but never out-right imposition of rule and they've gotten less and less bad at how they're doing it over time. I mean compare the Iraqi or Afghani government during occupation with the likes of Batista.

Then, and this (as well as that Marvel reference I couldn't give less of a fuck) makes me think you're American: It's the first war by a major power in Europe since WWII. We thought we had that shit behind us, that Yugoslavia was a regrettable exceptions caused by small-minded autocrats exploiting ethnic tensions for their own benefit. But, nope, actual full-scale war has come back to Europe because unlike the rest of Europe Russia hasn't gotten the memo that imperialism is soooo 18hundreds. As a yank you wouldn't understand.