How did the eastern front affect the USSR in World war 2?

The Eastern Front was pivotal for the USSR during World War II, as it witnessed some of the war's largest and deadliest battles, leading to immense Soviet casualties and destruction of infrastructure. The brutal fighting, particularly during the German invasion known as Operation Barbarossa, strained Soviet resources and tested military strategies. However, the USSR's eventual resilience and counteroffensive, especially at battles like Stalingrad and Kursk, turned the tide against the Nazis and significantly contributed to the overall Allied victory in Europe. This front also shaped Soviet military tactics and post-war territorial expansions.