How about fighting hard and keeping a huge part of the German Army occupied in Russia.
Not to defend Stalin for his beliefs or how he dealt with his people but without the Soviet machine, we wouldn’t have won WWII. Had Hitler not invaded Russia, we would have faced the entire might of the Nazi military might.
Stalin didn’t have troops in Normandy but his people gave their lives fighting the Germans and by that sacrifice allowed the other allied forces to secure Normandy.
Like I said, he was a tyrant and a POS but he had a critical role in defeating the Nazi’s. Revisionist history is NOT a good thing in any direction. We must look the good and the bad in the face. If not, we’ll do it all again.