They kept the Wehrmacht occupied for a couple of years. Millions died. The US & Britain sent them convoys of war material, for which the Soviets nearly said thanks, I think.
Oh yes, they signed a non agression pact with tler in 1939 & invaded Poland in concert with him, & they nearly helped the Polish forces in 1944 in the Warsaw uprising. I think the Russians freed Eastern Europe from Nazi control only to replace it with their own tyrannical domination.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.