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The Soviet involvement with Poland at the begginning of the war is explained in the link below.
Poland
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
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Kaliningrad:(part of Russia) and Lithuania
Poland
soviet union
russia poland
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.
The Kaliningrad Oblast is a Russian exclave located between Poland and Lithuania, along the Baltic Sea. It is geographically separated from the rest of Russia, with Poland to the south and Lithuania to the north and east. Kaliningrad has a strategic significance due to its location on the Baltic coast.
Poland, Lithuania, Latvia and Estonia.