I know that many Ukrainians fought in Hitlers army, but did others join the Russia army?? What does WWII history say???
I would assume that since a large percentage of Russians live in Ukraine, that a good number of them fought in Russian units because Ukraine was part of the Soviet Union at the time. Some Ukrainians may have even joined resistance forces during WWII. I know from reading a book about the Vilna Jewish Ghetto in what is now Lithuania, that the Vilna resistance fighters that fled the ghetto into the forest, met up with Russian partisans, and fought alongside them, and the Red Army to push the Germans out of the city of Vilna in July of 1944. There could have been Ukrainians serving with those partisans, and/or within the ranks of the Red Army as well.
Ukrainians fought against the invading Russians, against the Germans, against the invading Russians, and against anyone else who tried to conquer them.