Question: The German invasion began one week after the signing of what neutrality pact between Nazi Germany and the Soviet Union signed in Moscow on 23 August 1939?
Sentence (from "List of Ambassadors of Poland to Russia"): After Soviet invasion of Poland in 1939 those relations were broken, to be briefly reestablished in 1941 after the German invasion of the Soviet Union, when the Soviet Union and Polish government in exile agreed to cooperate against their common enemy, Nazi Germany.
Relevant evidence: No