This is a real stab in the back, not like the Nazis’ made up stories about the cause of Germany losing WWI (https://en.wikipedia.org/wiki/Stab-in-the-back_myth). In Soviet Russia independent Poland, back stabs YOU!!
Really? Did you even read the article? „The Invasion of Poland, known in Poland as the September Campaign (Kampania wrześniowa) or the 1939 Defensive War (Wojna obronna 1939 roku), and in Germany as the Poland Campaign (Polenfeldzug) or Fall Weiss ("Case White"), was a joint invasion of Poland by Germany, the Soviet Union, the Free City of Danzig, and a small Slovak contingent that marked the beginning of World War II.“