And furthermore, just because two imperial powers are opposed to each other doesn't mean they're equally imperialist. Invading a country at your border to keep NATO out, and actively trying to turn several hollowed-out, bombed-out, neoliberalized post-soviet states halfway across the world from you into vassals of your military hierarchy are orders of magnitude different.

While using a humanitarian crisis (ukrainian nazis, ethnic cleansing in donbass) as a cynical pretense to invade is something the US is also very experienced in doing, there's something to be said about the fact that Russia didn't deliberately create the humanitarian crisis. Almost every humanitarian crisis the US uses to invade other countries were actively engineered by the US in advance. The US would have never experienced 9/11, for example, if it hadn't spent the 50s, 60s, 70s, and 80s funding, aiding, training, and propping up reactionaries in the middle east.