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1939 in the Soviet Union

  • Soviet occupation of the Baltic states (1940)On the 18th of September 1939, a Polish submarine escaped from Tallinn into the Baltic Sea. This single event triggered a chain of ultimatums that would…
  • Soviet invasion of PolandThe Peace of Riga treaty signed on the 18th of March 1921 drew a new line between Poland and Soviet Russia. This agreement divided disputed territories after…
  • Winter WarOn the 30th of November 1939, Soviet forces invaded Finland with 21 divisions totaling 450,000 men. This attack came three months after the outbreak of World…
  • Battles of Khalkhin GolThe river Khalkhin Gol cuts through a disputed strip of land where the borders of Manchukuo and Mongolia meet. In 1939, this remote area became the stage for…