Was the German invasion of the soviet union stopped with the nonaggression pact?

No, the German invasion of the Soviet Union was not stopped by the nonaggression pact. The Molotov-Ribbentrop Pact, signed in 1939, temporarily ensured that Germany and the Soviet Union would not attack each other, allowing Germany to focus on its military campaigns in Western Europe. However, this arrangement broke down when Germany launched Operation Barbarossa in June 1941, invading the Soviet Union despite the previous agreement.