<P> The Soviet invasion of Poland was a Soviet military operation that started without a formal declaration of war on 17 September 1939 . On that morning , 16 days after Germany invaded Poland from the west , the Soviet Union invaded Poland from the east . Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two - way division and annexation of the entire territory of the Second Polish Republic by both Germany and the Soviet Union . The joint German - Soviet invasion of Poland was secretly agreed to following the signing of the Molotov - Ribbentrop Pact on 23 August 1939 . </P>
<P> The Soviet invasion of Poland was a Soviet military operation that started without a formal declaration of war on 17 September 1939 . On that morning , 16 days after Germany invaded Poland from the west , the Soviet Union invaded Poland from the east . Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two - way division and annexation of the entire territory of the Second Polish Republic by both Germany and the Soviet Union . The joint German - Soviet invasion of Poland was secretly agreed to following the signing of the Molotov - Ribbentrop Pact on 23 August 1939 . </P>
when did germany and the soviet union split poland
when did germany and the soviet union split poland
6 October 1939
6 October 1939