The subversive elements in the Ukraine were apparently supported by $5 billion dollars in US aid and by private foundations, such as Obama and Bill Ayers used to manage. If these protests look a lot like Occupy Wall Street protests, there is probably good reason for that. Government tax money and private foundations also support radical revolutionary groups in the US.
The same people that engineered the revolution in Ukraine would like to do the same in the US. Whether it comes from the left (OWS) or the right (American Spring) does it really matter? It would not be predictable who takes over after the Government is toppled. Fortunately, Americans are not that easy to motivate for a revolution.