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This is not about what Russia is doing. Russia, like the US, is an imperial power that cares little about the rights of other. This is about the US testing how much it can get away with by enroaching on what it mistakenly thought was a much weaker Russia than it turned out. And Ukranians are paying the price in blood, often against their will.
The US supports what benefits them, so I'm sure they were supporting the opposition. Russia was supporting the then president Yanukovych because that was the best for them. That's what countries do.
The protests started when Yanukovych decided to cancel the EU - Ukraine Association Agreement[0] to go do a similar agreement with Russia[1]. Now, while the US might be supporting the opposition, this decision was made by the government supported by Russia in a country that was turning to the EU for a long time (the exception was the Donbas and Crimea)... of course people were going to protest. After what they experienced in the 90's and early 00's, with many working in the EU for a while and seeing it as a better option, are you surprised that many would want to be aligned with the EU?
How do you go from a protest to killing protestors? That I don't know. Are you going to blame the US for the actions of the Russia-backed government? Maybe they were also part of the conspiracy... /s
In any case, this doesn't justify Russia's invasion of Crimea or the infiltration of the Donbas which preceded many of the horrors that are now known. Their actions and their president history lessons are examples of the imperialism you blame the US for. As someone that seems to have a problem with imperialism, you should be criticising them, but are not... why is that?
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1. https://en.wikipedia.org/wiki/European_Union%E2%80%93Ukraine...
2. https://en.wikipedia.org/wiki/Customs_Union_of_the_Eurasian_...