The young Republic of Estonia felt more and more threatened since the begin of the World War II, and for good reason. They don't know, but in the secret Molotov-Ribbentrop Pact the Soviet Union got the Baltic States promised by Nazi Germany. As a consequence, the Soviet Union forced Estonia as soon as late September 1939 to sign a "mutual assistance pact" with them - which allowed the Soviets to create military bases in Estonia. The fact that both sides had a non-aggression pact with Germany didn't help them. On June 11th in 1940, they received an ultimatum; on the next day, the country was occupied.
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