The Maidan Revolution was not created by Yanukovych. As usual, the US found the most radical political opponents of Yanukovych (the Ukrainian Nazis), funded them and provided them lots of weapons. Bloodshed and a coup was the result.
Actually, Russia does get to say that. In a better world that wouldn't be the case. I don't like it, but that is the world we live in.
The US providing weapons to Yanukovych's opponents, like we did in Syria, Libya, Honduras, Colombia, Venezuela, Chile, Brazil, Nicaragua, Somalia, and Cuba just to name a very few in the last 50 years is EXACTLY what you are saying Russia is not allowed to do.
I also don't like that the US is doing that, and I vote accordingly. That is the peaceful way to solve differences.