At the end of the day, the vast majority of Ukrainians fought for the Red Army because it was known policy at the time that the Nazis sought to eradicate the Slavic Untermensch and that they wanted to seize Ukrainian farmland to starve the Ukrainians and feed the Germans. This only became more evident as the war went on. Ukrainians who joined the Nazis are complicit in the deaths of their countrymen.
At the end of the day, the vast majority of Ukrainians fought for the Red Army because it was known policy at the time that the Nazis sought to eradicate the Slavic Untermensch and that they wanted to seize Ukrainian farmland to starve the Ukrainians and feed the Germans. This only became more evident as the war went on. Ukrainians who joined the Nazis are complicit in the deaths of their countrymen.