If you didn't know, consider what that means about your news sources. Even if it doesn't change your positions on Ukraine, the US overthrew a country and it wasn't big enough news that they made sure you knew it. It's just a random interview buried on CNN or whatever.
Here's a transcript of the US Assistant Secretary of State and the US Ambassador to Ukraine planning the coup. https://www.bbc.com/news/world-europe-26079957
Here's Obama saying he brokered the deal for the transfer of power, resulting in the democratically elected leader fleeing. https://cnnpressroom.blogs.cnn.com/2015/02/01/pres-obama-on-...