I am having trouble locating a good English book on the subject, or for that matter, on Ukrainian politics since 1989. Does anyone have any suggestions or recommendations? I am interesting in Polish and Ukrainian politics, although my interest falls more heavily on the Polish side.
Alas, there's no such thing - such books are heavily politically biased - I'm pretty sure there's no work in English with is impartial.
Your best bet is to do what I did and read lots on Google - there's a wealth of old news stories out there about Poland, which gives you the idea of how things were.