The Normandy landings were an impressive and costly military operation, but they cannot be compared to the scale of the Red Army's offensive in the east. This was quite clear to anyone with the slightest knowledge of the conduct of the war, including the Allied commanders and the governments they represented.
The truth is that the war against Hitler in Europe was fought mainly by the USSR and the Red Army. For most of the war the British and Americans were mere spectators. Following the invasion of the Soviet Union in the Summer of 1941, Moscow repeatedly demanded the opening of a second front against Germany. But Churchill was in no hurry to oblige them. The reason for this was not so much military as political.
The policies and tactics of the British and American ruling class in the Second World War were not at all dictated by a love of democracy or hatred of fascism, as the official propaganda wants us to believe, but by class interests. When Hitler invaded the USSR in 1941, the British ruling class calculated that the Soviet Union would be defeated by Germany, but that in the process Germany would be so enfeebled that it would be possible to step in and kill two birds with one stone. It is likely that the strategists in Washington were thinking on more or less similar lines.
But the plans of both the British and US ruling circles were fundamentally flawed. Instead of being defeated by Nazi Germany, the Soviet Union fought back and inflicted a decisive defeat on Hitler's armies. The reason for this extraordinary victory can never be admitted by the defenders of capitalism, but it is a self-evident fact. The existence of a nationalised planned economy gave the USSR an enormous advantage in the war. Despite the criminal policies of Stalin, which nearly brought about the collapse of the USSR at the beginning of the war, the Soviet Union was able to swiftly recover and rebuild its industrial and military capacity.