The Alliance between Nazi Germany and the Soviet Union Joint parade at Brest. On September 1st, 1939, barely a week after the Molotov-Ribbentrop pact was signed, Germany invaded Poland. The Soviet Union invaded Poland from the east on September 17th from the east and started advancing westward. On September 23rd, Nazi Germany and the Soviet Union held a joint parade at Brest (Brest-Litovsk), commemorating the withdrawal of German troops from the city and signing the city over to Soviet rule. The joint parade was led by German general Heinz Guderian and Soviet general Semyon Krivoshein. Semjon Krivoshein congratulated Guderian and invited him to visit Moscow after Germany had defeated Britain. Both men had been near Kazan (Soviet Union territory) in 1929, where Guderian was part of an inspection of a tank warfare school training German officers.
German and Red Army soldiers near the Border of Peace. The border was set by the Molotov-Ribbentrop pact.