The Soviet Union did the heavy lifting in World War II. From Michael Jabara Carley at strategic-culture.org:
Every May 9th the Russian Federation celebrates its most important national holiday, Victory Day, den’ pobedy. During the early hours of that day in 1945 Marshal Georgy Konstantinovich Zhukov, commander of the 1st Belorussian Front, which had stormed Berlin, received the German unconditional surrender. The Great Patriotic War had gone on for 1418 days of unimaginable violence, brutality and destruction. From Stalingrad and the northern Caucasus and from the northwestern outskirts of Moscow to the western frontiers of the Soviet Union to Sevastopol in the south and Leningrad and the borders with Finland, in the north, the country had been laid waste. An estimated 17 million civilians, men, women and children, had perished, although no one will ever know the exact figure. Villages and towns were destroyed; families were wiped out without anyone to remember them or mourn their deaths.
Most Soviet citizens lost family members during the war. No one was left unaffected.
Ten million or more Soviet soldiers died in the struggle to expel the monstrous Nazi invader and finally to occupy Berlin at the end of April 1945. Red Army dead were left unburied in a thousand places along the routes to the west or in unmarked mass graves, there having been no time for proper identification and burial. Most Soviet citizens lost family members during the war. No one was left unaffected.
The Great Patriotic War began at 3:30am on 22 June 1941, when the Nazi Wehrmacht invaded the Soviet Union along a front stretching from the Baltic to the Black Seas with 3.2 million German soldiers, organised in 150 divisions, supported by 3,350 tanks, 7,184 artillery pieces, 600,000 trucks, 2,000 warplanes. Finnish, Italian, Romanian, Hungarian, Spanish, Slovakian forces, amongst others, eventually joined the attack. The German high command reckoned that Operation Barbarossa would take only 4 to 6 weeks to finish off the Soviet Union. In the west, US and British military intelligence agreed. Besides, what force had ever beaten the Wehrmacht? Nazi Germany was the invincible colossus. Poland had been crushed in a few days. The Anglo-French attempt to defend Norway was a fiasco. When the Wehrmacht attacked in the west, Belgium hurried to quit the fight. France collapsed in a few weeks. The British army was driven out of Dunkirk, naked, without guns or Lorries. In the spring of 1941, Yugoslavia and Greece disappeared in a matter of weeks at little cost to German invaders.
The Red Army’s losses were unimaginable, two million soldiers lost in the first three and a half months of the war.
To continue reading: The Russian V-Day Story (Or The History Of World War II Not Often Heard In The West)