There are definitely at least two distinct narratives. Narrative A (being pushed by the mainstream media and by Biden and Blinken) is that Putin is an imperialist who had no excuse for invading Ukraine, and we must keep pouring money and weapons into Ukraine for as long as it takes to stop Putin from taking over Europe. Narrative B is that the West largely provoked Putin into war by continuing to press for NATO expansion into Ukraine, after he had made it clear many times that he regarded this as an existential threat. According to this narrative, all Putin wants is a guarantee of Ukrainian neutrality, and we can end the war very quickly by agreeing to this. Of course, after losing 300,000 men, Putin will not give up his territorial gains.
The guy who actually pushed western military aid into Ukraine was Duda of Poland. Followed quickly by the Baltic governments.
Biden and etc. followed.
Narrative A is the general Euro narrative, across the political landscape there. There are more players in this than just the US. And that also applied to NATO expansion, etc.
NATO was dead for all practical purposes in Feb 2022. Russian “concerns” on that score were and are purely propagandistic.
What we are seeing of course is what we see so often— we have to make the best of a bad situation because it’s too late to do the right thing.