From the Guardian:
Imagine for a moment that around half the population of Great Britain - men, women and children - died in the second world war. What kind of extraordinary trauma would this represent? How would "victory" in 1945 now be viewed, or even celebrated? Yet 27 million is the estimate of Soviet deaths by the end of the war. Actual British losses represented around 0.6% of the population; American losses were smaller, around 0.3%.
These losses were the brutal product of German invasion in 1941 and the Soviet determination to resist that aggression and expel the Germans from their territory. The scarcely credible level of sacrifice exposes just how vast and savage the war on the eastern front was. It was here that the great majority of German casualties occurred. It was here that the war was won or lost, for if the Red Army had not succeeded against all the odds in halting the Germans in 1941 and then inflicting the first major defeats at Stalingrad and Kursk in 1943, it is difficult to see how the western democracies, Britain and the US, could have expelled Germany from its new empire.
97% of German military losses occured at the hands of the Soviet Union, let's try and keep things in perspective, a war started by Britain and France and paid for by the Soviet Union.