Short answers, pulled from the story.
The Russian Ministry of Defense study led by General G. F. Krivosheev listed 8,668,400 military deaths in 1993. This figure included 5,226,800 killed in action and 1,102,800 who died from wounds in field hospitals.
Demographic studies suggest total civilian casualties ranged from 13.7 million to over 17 million depending on the source used. Civilian losses included 7,420,135 people killed through direct violence in occupied regions plus another 2,164,313 who died while working as forced laborers in Germany.
Nikita Khrushchev raised the official Soviet death toll to 20 million in November 1961. Joseph Stalin had previously announced in March 1946 that Soviet losses totaled 7 million dead before this revision.
The Ukrainian SSR lost an estimated 6,850,000 people representing 16.3 percent of its prewar population. Smaller republics like Yakutia saw 60.74 percent of drafted citizens fail to return home.
Western scholars estimate that 3.3 million Soviet prisoners of war died out of 5.7 million captured. German records show 5,734,000 Soviet POWs were taken during the conflict and roughly 930,000 remained in German camps by January 1945.