<P> The Soviet invasion of Poland was a military operation by the Soviet Union without a formal declaration of war . On 17 September 1939 , the Soviet Union invaded Poland from the east , sixteen days after Germany invaded Poland from the west . 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 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 military operation by the Soviet Union without a formal declaration of war . On 17 September 1939 , the Soviet Union invaded Poland from the east , sixteen days after Germany invaded Poland from the west . 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 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 the soviet union take over poland
when did the soviet union take over poland
17 September 1939
17 September 1939