Nazi foreign minister Joachim von Ribbentrop (left), Soviet leader Joseph Stalin (center), and Soviet foreign minister Viacheslav Molotov (right) at the signing of the nonaggression pact between Germany and the Soviet Union. Moscow, Soviet Union, August 1939. Photograph »

Soviet foreign minister Viacheslav Molotov signs the German-Soviet pact as Soviet leader Joseph Stalin (white uniform) and German foreign minister Joachim von Ribbentrop (behind Molotov) look on. Moscow, Soviet Union, August 23, 1939. Photograph »

Two German sentries stand guard at Augustow on the demarcation line between Soviet- and German-occupied Poland. September 1939. Photograph »

A post marked with Soviet symbols along the demarcation line between German- and Soviet-occupied Poland. Photograph »