I agree that discussing who should and should not be in the government of an independent state is wrong.
But there was no coup and Yanukovych himself signed an agreement whose first point stipulated government change, Yanukovych decided to flee on his own and Yanukovych was impeached by democratically elected parliament.
USA did not start the protests. The protests started because people, especially around Kyiv, wanted and still want more than ever across the whole Ukraine to join EU. Yanukovych was elected with the promise of joining EU as a strategic goal.
At the same time, on 27 February 2014, masked Russian troops without insignia took over the Supreme Council (parliament) of Crimea and captured strategic sites across Crimea. Crimea was annexed on 18 March 2014 by Russia.