USSR military dead 8,668,000 to 11,400,000
USSR civilian dead due to war 4,500,000 to 10,000,000
USSR civilian dead due to famine and disease 8,000,000 to 9,000,000
Total USSR dead in WW2 20,000,000 to 27,000,000
Far more dead than you mentioned:
The Soviet Union:
WWII Combat deaths: 26,400,000 - Sokolov (source)
WWII Civilian deaths: 24,000,000 - Korol (source)
Those numbers were the reason Stalin annexed all the countries behind the Iron curtain. His thought was quite simple.
Never again will we allow Mother Russia to be attacked from the west. The annexed territories were a buffer zone to kill the enemy before they ever reached the Russian border