Because the Soviets did far, far worse to them. The forced starvation of Ukraine in the early 30’s is one of the most underreported genocides of the 20th Century. It isnt that difficult to see why many Ukrainians chose the Nazi’s as the lesser evil.
In Poland the Soviets killed or relocated millions, in their march to capture Germany, they raped any woman or girl they could get their hands on.
Soviet brutality almost made the Nazi’s seem compassionate. When your life is surrounded by sheer brutality, you latch on to any measure of possible freedom, no matter how fleeting.
I still have a lot of family in both Poland and Ukraine, these comments about Nazi’s taking over are way over blown, if you want to see real fascism, take a gander at what is going on in Russia nowadays.
The people in Ukraine are fed up though for the most part, Russia has been manipulating them and treating them like a satellite state even after the Soviet split. They push puppets like Yanukovych to further their interests, a criminal who robbed the nation blind. Ukrainians want nothing to do with joining NATO, but they so wish to join the EU, particularly the younger generation. They want a measure of independence from Russia and are tired of their nation being a Russian puppet.
Still no excuse for worshipping the Nazis.