This is a fairly representative sampling of the protest posters. You've got a big poster saying "Не стріляй!" - "Don't Shoot!" ; a bumper sticker below it reading "Кучмізм - це Я" which is against "Kuchma-ism" or attempts by the current President to maintain control of Ukraine; and a lampoon of Yanukovych which someone has described with the word "Пітух!" which means "Rooster!" (I think that has implications that he's cheeky or something.