The Soviet Union is estimated to have lost 27,000,000 people in WW2, both civilian and military.
According to https://worldpopulationreview.com/country-rankings/world-war-two-casualties-by-country, "Among the Soviet Union's 15 republics, Russia withstood the highest number of casualties, with 6,750,000 military deaths and 7,200,000 civilian deaths." This means that Russia had the greatest number of casualties of any country in WW2.
What brilliant Russian maneuver are you referring to?