Neville Chamberlain, the Prime Minister of Britain, returned to London with a signed agreement from Hilter and Mussolini, where they agreed to not invade anymore countries. It was signed Sept 30, 1938. Germany invaded Poland on Sept 1, 1939. It would appear to the layperson, the agreement was signed primarily to give the Germans time to cement their plans.
Comparisions to those times and what we are seeing today with Russia/Ukraine are chilling in their similarities.