If Yanukovitch does this he will be in very hot water. The Ukrainians have no wish to rejoin with the Rusian Bear.
Actually the past elections seem to indicate otherwise.
A couple of years ago that was the case ...but Viktor Yushchenko (and somewhat Yulia Tymoshenko, although she survived, and is still in government) totally squandered the Orange Revolution. If I recall correctly in the 2010 elections Yushchenko did not even place in the top 3 (he was number 5 ...just checked). Sad because when the whole thing started 5 years ago there was so much hope ...I guess criticising the train service is easier than running the darn things (to paraphrase).