The Soviet involvement with Poland at the begginning of the war is explained in the link below.
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Type your answer here... Germany and Russia
Poland
The part of Russia between Poland Lithuania is Kaliningrad, now known as Kaliningrad Oblast. It is also located near the Baltic Sea.
Germany and Russia split Poland between them, Germany invaded Poland from Danzig and went south, Russia lined up the border and attacked the whole front at once
soviet union
Poland
russia poland
Kaliningrad:(part of Russia) and Lithuania
It depends on which century you're talking about - in the 18th & 19th century Poland was partitioned between Prussia, Austria & Russia. It regained independence after the First World War but was invaded by Germany and Russia and divided between them in 1939.
Belarus is between Poland and Russia. It is often referred to by Russians as the White Russia or the White Rus.
Russia, though Poland and Australia are in between them.