Russian supporters keep making this claim, and never back it up with real evidence. Russia released an intercepted phone call of Victoria Nuland in 2014. After Russia invaded Ukraine, this is the only "evidence", really a convenient excuse, to claim a US/CIA backed coup.
To everyone else, Russia tried to buy off the Ukrainian government and failed. Which explains why Viktor Yanukovych looted the Ukrainian treasury and fled to Russia. It also explains why the medals for annexing Crimea were made before the Maidan revolution.
But why let facts get in the way of useful accusations? < /s >
Look at the maps of NATO moving eastaover time and try to make that claim....
And that phone call was a discussion about how to preserve Yanukovich in office! Not planning to oust him. But the Russian lie got halfway around the world before the truth got its' boots on, and here we are.