Germany and Russia .
The Soviet Union
Poland
The German invasion of Poland
The Soviet invasion of Poland was informally declared on September 17, 1939. The invasion ended on October 6, 1939 with the division and annexing of Poland by the Soviet Union and Nazi Germany.
The Soviet Union signed a non-agression pact to buy time before the Germans attacked them. The pact also included secret clauses, one of which planned the division of Poland.
German invasion of Poland
No doubt you are thinking of appeasement.
The USSR
soviet union
Germany's invasion of Poland.
The German invasion of Poland... complements of THE DENNIS JONESGermany invading Polandthe German invasion of Poland