This was posted a few days ago...with a YouTube link. When I followed the YT link, it also led to a ret’d general’s discussion & slideshow of the Russian-German portion of WW2.
Frankly, the casualties and expenditure of war effort of all but the very largest US-Cana-UK allies were almost nothing compared to the tribulations of the Russian-German conflict. I only bring this up as a point of reference, not to denigrate any country’s contribution.
The Russians lost the entire casualty count of the US in a good number of 1-2-3-10 day battles-—about 35-40 times.
In the battle of Smolensk in early July, 1941 the German Army captured some 600,000 Russians in a three-day period.
That happens when soldiers are considered expendable. Half the Russian machine guns were pointed at their own soldiers.