yep, sounds like Nuland was trying to manipulate an obama friendly regime.
And not evidence the US overthrew the US government. Unless you work for Russia Today, of course.
That's what the State Department does - attempt to get people friendly to American interests in power. The Russian Foreign Ministry tries to get its people on top. They lost this round and chose to invade Ukraine. Your sympathy for your co-ethnics is understandable as a purely tribal reflex. The problem is that tribal reflexes and American interests are not necessarily compatible.