If I remember correctly, Yushchenko used the corruption affair of a minister who was his own ally to dismiss Tymoshemko with her government. So I am not at all certain that Yushchenko wants a clean-up - rather than being an ally of this or that new player on the Ukrainian side who was pushing for a larger share of the cake. *Lunatic*, n. One whose delusions are out of fashion.
But it's equally (or more) likely that he was trying to get in (or get allies in) the gas trade business... In the long run, we're all dead. John Maynard Keynes