What was the USSR's justification for invading Poland in 1939?

On this day in 1939, Soviet Foreign Minister Vyacheslav Molotov declares that the Polish government has ceased to exist, as the U.S.S.R. exercises the. read more

The initial invasion of 1939 was a part of the Molotov-Ribbentrop pact: a piece of realpolitik to grab parts of what had once been part of the Russian Empire, and revenge for the defeat in the SU/Polish war of 1920-21. read more

The invasion of Poland led Britain and France to declare war on Germany on 3 September. However, they did little to affect the outcome of the September Campaign. No declaration of war was issued by Britain and France against the Soviet Union. read more