The Soviet NKVD was ordered to be ready for the reception of 58,000 prisoners of war.
Estonia passed a law ratifying its neutrality on December 1st, 1938, which was modelled on Sweden's declaration of neutrality of May 29, 1938.
Early in the morning of August 24, 1939, the Soviet Union and Nazi Germany signed a 10-year non-aggression pact, called the Molotov–Ribbentrop pact.
In the summer of 1940 the occupation of Estonia was carried through as a regular military operation.
160,000 men, supported by 600 tanks were concentrated for the invasion into Estonia.
Finland held out in the Winter War until March 1940, when the Moscow Peace Treaty was signed.
The first population loss for Estonia was the repatriation of about 12,000–18,000 Baltic Germans to Germany.In the Summer War during the German Operation Barbarossa in 1941, the pro-independence Forest Brothers captured South Estonia from the NKVD and the 8th Army before the arrival of the German 18th Army.At the same time, the Soviet paramilitary destruction battalions carried out punitive operations, including looting and killing, based on the tactics of scorched earth proclaimed by Joseph Stalin.b) A navy squadron including three destroyer divisions were positioned to the west of Naissaar in order to support the invasion.c) The 1st marine brigade's four battalions on transportation ships Sibir, 2nd Pjatiletka and Elton were positioned for landing and invasion of Naissaare and Aegna; d) Transportation ship Dnester and destroyers Storozevoi and Silnoi were positioned with troops for the invasion of the capital Tallinn; e) the 50th battalion was positioned on ships for an invasion near Kunda.Most notably, the pact contained a secret protocol, revealed only after Germany's defeat in 1945, according to which the states of Northern and Eastern Europe were divided into German and Soviet "spheres of influence".