Hitler and Stalin agreed to invade Poland simultaneously. Stalin, planning to establish Communism in the whole of Europe, didn’t keep his promise and invaded Poland only 17 days later, to look like a “liberator”. The invasion of Poland was explained to Soviet people as protection from the Germans.
On September 17th, the Soviet Red Army invaded Poland against the Soviet-Polish Non-Aggression Pact and other international treaties. In total, 3,000 – 7,000 Polish soldiers died fighting the Red Army, with 230,000 – 450,000 taken as prisoners. The Soviets executed all the Polish officers they captured after the Battle of Szack, on 28 September 1939. Over 20,000 Polish military personnel and civilians perished in the Katyn massacre.
This video shows one example of Russia’s shameful history of collaboration with the nazi Germany: the German–Soviet military parade in Brest-Litovsk.
The Battle of Brest-Litovsk took place between 14 and 17 September 1939. After three days of heavy fights for the stronghold in the town of Brześć, the Germans captured the fortress and the Poles withdrew. According to the terms of the 1939 German-Soviet Nonaggression Pact the territory around Brest as well as 52% of the then Poland was assigned to the Soviet Union.
The Soviet 29th tank brigade under Brigadier Semyon Krivoshein reached the area of Brześć on September 21st and took over the fortress from Wehrmacht.
A joint Nazi Soviet parade was held in the town, after which the German forces left the area. The XIX motorized Corps of Wehrmacht and the 29th Tank Brigade of the Red Army participated in the parade.