To be accurate, it was 27,000,000 lost of the entire Soviet Union, of which 5,000,000 of the dead were from the Ukraine. The Soviet Baltic states also contributed a significant amount to that number. But I completely understand your point.
That is a part of history that I have interest in and read a lot about. By the time D-Day happened and the allies landed in France the German war effort was pretty much a lost cause by that point. The only problem was that Hitler didn't accept that nor his fanatical followers. If the Nazi regime didn't insist on fighting to the death and carrying on the war until every last German man, woman, and child were dead, millions of lives would have been saved. Or in other words, if the German command were sensible and level headed and could see that losing the war was inevitable in 1944 and thus initiated peace talks with hat in hand to end it then .