06 August - Estonia is annexed by the Soviet Union in 1940

On 06 August 1940, Estonia was formally annexed by the Soviet Union. This annexation was part of the broader Soviet occupation of the Baltic states, which included Latvia and Lithuania. The process began in June 1940, when Soviet troops entered Estonia following an ultimatum demanding the establishment of Soviet military bases on Estonian territory. Under significant pressure, the Estonian government complied, and soon after, Soviet forces took control. Subsequent to rigged elections and the installation of a pro-Soviet government, Estonia was officially incorporated into the Soviet Union as the Estonian Soviet Socialist Republic. This period of Soviet rule lasted until Estonia regained its independence in 1991 following the collapse of the Soviet Union.