Voting for Yanukovych does not translate into wanting to be part of Russia.
Read about what he did when in power, lots of Ukrainians have changed their mind about him.
http://www.nybooks.com/blogs/nyrblog/2014/mar/01/ukraine-haze-propaganda/
“So they wind up switching from one oligarchical faction to another, forming broad popular coalitions that can be easily co-opted by the most politically organized minority factions within—neoliberals, neofascists, or Kremlin tools. All of whom eventually produce more of the same shitty life that leads to the next revolution.”
https://tendancecoatesy.wordpress.com/2014/02/25/ukraine-everything-you-know-may-be-wrong/