Some powerful Neo Nazis are behind this coup.
With the help of the US.
So yes,it is the Russians or the Nazis this time around.
Of course, Ukraine being Ukraine...Russians and Nazis may form a coalition, too.
“Everyone looking for a proxy side to support or oppose in the Ukraine political dynamic will be disappointed. Ukraine politics go by their own rules. Today’s neoliberal ultranationalist could be tomorrow’s Kremlin ally, and visa-versa. Just look at what happened to the Orange Revolution—nothing. To wit:”
https://tendancecoatesy.wordpress.com/2014/02/25/ukraine-everything-you-know-may-be-wrong/
It’s not a coup. It’s a rebellion. There’s a difference. Also, the prime players are Ukrainians who were fed up with the corruption of the pro-Moscow regime. Thus, it is not “Russians or the Nazis this time around”.