The USA government absolutely had a hand in the Maidan revolution. There was even a leaked phone call where state department officials discuss who to pick for the new government.
All that leaked phone call between Nuland and Pyatt shows is that the US most likely participated in the (failed) negotiations for a new government with Yanukovych
as the president and a opposition candidate as the prime minister.
It isn't, however, a proof that the US somehow caused the protests to happen. How would that even work?
On the other hand, there's a mountain of evidence for Russian military involvement in 2014, including Putin himself admitting that.
