A lot of the war was fighting inside of Russia, of course their casualties would be extremely high.
Something about lend-lease
http://ww2-weapons.com/lend-lease-tanks-and-aircrafts/
“A lot of the war was fighting inside of Russia, of course their casualties would be extremely high.”
Such a conclusion is not valid when you look at all of the combatants in which the civilian population came under direct attack. The Soviet Union is in a class of only a few combatants who suffered 10 percent or more of their civilian population killed. The other nations besides the Soviet Union suffering 10 percent or greater such casualties were Poland, Yugoslavia, and Czechoslovakia. Although China is not among those nations, it did suffer some 10,000,000 or more civilians killed.
The other combatants who did not suffer nearly so great a percentage of civilian casualties when they came under direct attack include Great Britain, Norway, Finland, Denmark, the Netherlands, Belgium, Hungary, Bulgaria, Germany, Greece, Albania, Italy, Austria, Spain, Syria, Iraq, Algeria, Libya, Eritrea, British Somalialand, Italian Somalialand, Ethiopia, Madagascar, Burma, British Malaya, Dutch East Indies, French Indochina, the Philippines, New Guinea, the Solomons Islands, and Japan.