You mean after the Wehrmacht took 1,000,000 square miles of territory before literally getting stuck in the mud a few miles out of Moscow center?
Russian tactics of put a wall of bodies in front of the enemy didn’t really work, they got very fortunate with mother nature in 1942. The United States provided Russia with oil, trucks, diesel and even trains to keep going. For Russia or anyone to deny our involvement before we landed in Africa is kind of criminal, let alone disrespectful.
It’s always assumed America’s ‘sacrifice’ or level of involvement wasn’t as great as the other powers who lost millions of lives. Our tactics were better.
We had more money and more factories too. The country that can out produce their enemy in war machinery, and consistently supply their military, will likely be victorious.