1 - While Russia was the biggest component, it was the Soviet army - which included Ukraine (and led by a Georgian). So you're tarring both sides of the current war in your comment.
2 - It was a World War, tragic for all parties involved. You look at each side and they had moments of brilliance and absolute disasters. The Soviet Union (nor the UK) didn't have the luxury to sit back and scale their industry because the Axis forces were literally on their front, not separated by an Atlantic Ocean. Would the SU have won without American supplies? We don't know, but to downplay the player who was involved in the biggest military operations of the war that made D Day look like a side battle (Stalingrad, Kursk, Seelow Heights, Leningrad, Operation Bagration, search any one of those) shows a lack of historical awareness.
Edit - Adding to the above - more Civilians died in the Soviet Union than the total combined military deaths of the other Allied Powers. War is hell and shouldn't be romanticised or seen as a solution.