I'm honestly really sad that you don't know the details on this.
Yanukovych campaigned on signing the EU Association Agreement. It isn't even inherently a trade deal. Yanukovych U-turned on this, and took a big fat cheque from Russia. This made the population...pissed off. They voted for him because he fucking campaigned on it.
Well-funded revolution????? Did all of the protestors get a fat stack of US-bucks? Bullshit. As Euromaidan went on for a few months, protestors were eventually shot. Over 100 people were shot dead from police snipers - ordered by Yanukovych. Yanukovych fled the country as rataliatory violence increased, and parliament was dissolved. He claims his life was threatened - there is no direct evidence of this. It was revealed that he'd embezzled significant amounts of money from the Ukrainian treasury and took the cash with him when he fled. He reappeared in Russia, maintaining that he is still the legitimate President of Ukraine and that his removal was an illegal coup d'tat. He literally disappeared on February 22nd - couldn't be found, and parliament were not informed of his whereabouts.
and if anyone wants to point me to the Nuland-Pyatt call - expressing a preference for the present opposition leader isn't exactly a fucking conspiracy. after Yanukovych fled, they held an election where the Ukrainian people voted.
If you're against American Imperialism like that that occurred in Iraq - this is rather analogous. Plus, Russia has also had a bit of a history over the past century, and it wasn't all spurned on by the US. Condemning bad things should be easy. I get if people want to argue about cluster munitions, that makes sense. The Russian state is the defininitive bad actor here though. Flipping it into some "oh wow actually this is the fault of the USA and CIA please stop hating Russian people" is so fucking dumb. I literally know Russian people that have left. This war wasn't caused by "NATO aggression" or whatever dumb line has seeped into your conciousness.