1940 ⟶ Katyn Massacre and Soviet Occupation of Baltic States

April – May: The Katyn massacre of Polish soldiers in USSR a...
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Year
1921
1939
1940
1944

🕊️ Polish–Soviet War Ends

March 18: End of the Polish–Soviet War.⟶
Polish–Soviet War Ends (1921)
WarfareSoviet UnionTerritorial DisputesInterwar PeriodNationalismMilitary Conflict
PolandPolandSoviet UnionSoviet UnionLithuaniaLithuaniaUkraineUkraineBelarusBelarus

💣 Invasion of Poland: Outbreak of World War II

September 1 – October: Nazi invasion of Poland triggers World War II in Europe. Soviet invasion of Poland begins 16 days later.⟶
Invasion of Poland: Outbreak of World War II (1939)
World War IIInvasionSoviet UnionAggressionTotalitarianismEastern FrontAppeasement
PolandPolandGermanyGermanySoviet UnionSoviet Union

🪖 Katyn Massacre and Soviet Occupation of Baltic States

April – May: The Katyn massacre of Polish soldiers in USSR and the Soviet occupation of the Baltic states.⟶
Katyn Massacre and Soviet Occupation of Baltic States (1940)
World War IISoviet UnionOccupationMassacreBaltic StatesWar CrimesStalinTotalitarianism
Soviet UnionSoviet UnionPolandPolandLatviaLatviaLithuaniaLithuaniaEstoniaEstonia

⚔️ Winter War Ends: Soviet Union Victorious over Finland

March 13: The Winter War between Soviet Union and Finland ends with a costly victory for the USSR.⟶
Winter War Ends: Soviet Union Victorious over Finland (1940)
World War IISoviet UnionEastern FrontMilitary ConflictTerritorial DisputesTotalitarianism
Soviet UnionSoviet UnionFinlandFinland

💥 Operation Bagration: Soviet Offensive Cripples Germany

June – August: Soviet forces launch Operation Bagration on the Eastern Front, the biggest defeat in German military history.⟶
Operation Bagration: Soviet Offensive Cripples Germany (1944)
World War IIEastern FrontSoviet UnionMilitary OffensiveWarfare
Soviet UnionSoviet UnionGermanyGermanyBelarusBelarusPolandPolandLithuaniaLithuaniaLatviaLatviaEstoniaEstonia