Where did Stalin attack Germany?

Stalin did not directly attack Germany; rather, he was the leader of the Soviet Union during World War II, and the USSR initially signed a non-aggression pact with Germany in 1939. However, following Germany's invasion of the Soviet Union in June 1941 (Operation Barbarossa), the Red Army launched a counter-offensive, notably at the Battle of Stalingrad and later in the push toward Berlin in 1945. These engagements were crucial in turning the tide against Nazi Germany.