was decided by the German–Soviet Nonaggression Pact and its Secret Additional Protocol of August 1939. World War II casualties of Estonia, estimated at around 25% of the population, were among the highest in Europe. War and occupation deaths have been estimated at 90,000. These include the Soviet deportations in 1941, the German deportations and Holocaust victims. World War II began with the invasion and subsequent partition of an important regional ally of Estonia – Poland, by a joint operation of Nazi Germany and Soviet Union.
Soviet occupation
The fate of the Republic of Estonia before World War II was decided by the German–Soviet Nonaggression Pact of August 1939 after Joseph Stalin gained Adolf Hitler's agreement to divide Eastern Europe into "spheres of special interest" according to the Molotov–Ribbentrop Pact and its Secret Additional Protocol.
On 24 September 1939, warships of the Red Navy appeared off Estonian ports and Soviet bombers began a patrol over Tallinn and the nearby countryside. The Estonian government was forced to give their assent to an agreement that allowed the USSR to establish military bases and station 25,000 troops on Estonian soil for "mutual defence". On 12 June 1940, the order for a total military blockade on Estonia was given to the Soviet Baltic Fleet.
On 14 June 1940, while world's attention was focused on the fall of Paris to Nazi Germany a day earlier, the Soviet military blockade on Estonia went into effect, two Soviet bombers downed the Finnish passenger airplane "Kaleva" flying from Tallinn to Helsinki carrying three diplomatic pouches from the U.S. legations in Tallinn, Riga and Helsinki. On 16 June 1940, the Soviet Union invaded Estonia. The Red Army exited from their military bases in Estonia on 17 June. The following day, some 90,000 additional troops entered the country. In the face of overwhelming Soviet force, the Estonian government capitulated on 17 June 1940 to avoid
