With Europe on the brink of another major war, Soviet leader Joseph Stalin (1879-1953) viewed the pact as a way to keep his nation on peaceful terms with Germany, while giving him time to build up the Soviet military. German chancellor Adolf Hitler (1889-1945) used the pact to make sure Germany was able to invade Poland unopposed. The pact also contained a secret agreement in which the Soviets and Germans agreed how they would later divide up Eastern Europe. The German-Soviet Nonaggression Pact fell apart in June 1941, when Nazi forces invaded the Soviet Union. (History.com)