IIRC the Soviets lost more people just at Stalingrad than all the other allies lost everywhere.
The Soviets and the Germans each lost more at Kursk than the US lost in the entire war, Europe and Pacific.
The average life expectancy of a Russian soldier in Stalingrad was about 24 hours. At a state dinner in Moscow, Admiral Ernest J. King offered a toast to “the heroic fighting spirit of the Red Army.” Stalin replied “It takes a brave man to not be a hero in the Red Army.”