As far as the US and allies are concerned, this is very simply a war for the protection of Ukraine's sovereignty. Now that the US changed into a wannabe imperialistic nation, the picture is not so clear.
This is objectively not true. The US government absolutely participated in over throwing the existing pro-Russian government around 2014. The US does not fight wars for "moral principles" like sovereignty, they do it so they can maintain control over fossil fuel resources.
This war, like all wars, is a war of different wealthy individual and organization to control resources. All other views are propaganda generated to gather support for the loss of human life in the interest of oligarchs across the globe.
> Now that the US changed into a wannabe imperialistic nation,
I'm not sure I know anyone who has paid attention to global politics since WWII who would not describe the US as an "imperialistic nation". If you earnestly believe this is some new turn in US history you have a lot of catching up to do on our involvement in overthrowing governments around the globe to maintain US friendly leadership in counteries that control key strategic resources.
This is explicitly Russian propaganda. There is no evidence of this. Euromaidan happened because Ukrainians wanted to get closer to Europe, which is why they voted for people who said they would get closer to Europe, and then aggressively erupted into protest when that leader went to Russia and came back with a 180 degree different plan.
It's the same as Iraq, except using that US "soft power" everyone started fetishizing as of last month.