Incontrovertible facts, Hitler and Stalin signed a non-aggression pact with each other. Hitler and Stalin divided Poland between themselves and on 17 September 1939 Soviet troops entered eastern Poland. As part of the non-aggression pact Hitler and Stalin agreed to divide Europe into spheres of influence
I don't think there was any disagreement about that. This statement is where we disagree - "Stalin and Hitler were allies. They started world war II together. As allies."