I wouldnt go as to say most..... But there definately was a large Ukrainian population that greated the Germans as liberaters due to their hatred for Stalin.

For this so called Patriatism, Stalin later rewarded many and didnt exactly give them a medal.

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler