In 1944, the Soviet Union made significant advances across Eastern Europe toward Germany, including Operation Bagration, a massive offensive in Belarus against the German Army Group Centre. Stalin, Roosevelt and Churchill closely coordinated, such that Bagration occurred at roughly the same time as American and British forces initiation of the invasion of German held Western Europe on France's northern coast. The operation resulted in the Soviets retaking Belarus and western Ukraine, along with the successful effective destruction of the Army Group Center and 300,000 German casualties, though at the cost of more than 750,000 Soviet casualties.