This is blatant historical ignorance.
Nazi Germany massed 3.8 million military personnel for the invasion of the Soviet Union for Operation Barbarossa in June 1941; it was the largest invasion force in the history of warfare.
The German High Command's casualty figures for World War II (from Sept 1, 1939 to Jan 31, 1945) were 1,810,061 total combat deaths and 1,902,704 missing/POWs; of these totals, 1,105,987 deaths (or 61%+) occurred on the Eastern Front. Likewise for 1,018,365 of the missing/POWs (or ~53.5% of the total. When accounting for the wounded and sick during this period (4,429,875), the overwhelming majority occurred on the Eastern Front (3,498,059, or over 78%).
In other words, during this period, of all military casualties tabulated by Germany's own High Command, over two-thirds occurred whilst fighting the Red Army on the Eastern Front.
Other historical surveys, such as that released in 2000 by the German historian Rüdiger Overmans, report similarly lopsided figures.
The Eastern Front in World War II was the largest military confrontation in human history. It was thanks to Soviet counteroffensives following the winter of 1941 that bogged down the Wehrmacht into a war of attrition that ran contrary to their operational strengths. However, the old ethnic hatreds between the Germans (and their Prussian ancestry) and the Soviets (particularly those with Slavic ancestry, as the Nazis considered Slavs to be subhuman) ensured that no quarter would be given by either side, resulting in more death and destruction than any other theater of the war.
When comparing the USSR's population pre-WWII with the estimated casualty figures, it is no exaggeration to say that one out of every eight Soviet citizens died over a four year span. When considering the thousands upon thousands of cities, towns, and villages that were ravaged or completely destroyed, no aspect of the Soviet national consciousness was left untouched by the war: "That conflict, which ended sixty years before this book’s completion, was a decisive component – arguably the single most decisive component – of the Second World War. It was on the eastern front, between 1941 and 1945, that the greater part of the land and associated air forces of Nazi Germany and its Axis partners were ultimately destroyed by the Soviet Union in what, from 1944, its people – and those of the fifteen successor states – called, and still call, the Great Patriotic War." - Bellamy, Chris (2007). Absolute War: Soviet Russia in the Second World War. Macmillan, 2007. p. xix
To summarize in picture form:
