Doberman: the US government (and the majority of democratic nations at this point) have said that they don't recognise the Yanukovich 'win' and are claiming the election to be fraudulent. Almost all international observers claim to have witnessed fraud at the ballot box, including switching boxes and giving voters disappearing ink.
Yesterday, the Ukraine parliament denounced the election results, though I don't think this carries much weight legally speaking. The matter is to be decided in the Ukraine high courts.
Does anyone know how Supreme Court justices come to their position? Are they appointed officials? I would worry that they will be as corrupt as their exiting leader ...