I didn't ignore anything, I wrote about it in greater detail here. There was no "secret pact." As for the parade, it was marked for the withdrawal of the Nazis from where they had overstretched. As for Katyn, the Nazis "discovered" the site, and Goebbels was the one to popularize it, yet the execution method of shooting civilians (children included) from behind into a mass grave was one the Nazis repeated countless times yet the Soviets were never found to "repeat" this method, and further, the ammunition was from Nazi Germany.