Occupation of The Baltic States - Background

Background

Early in the morning of August 24, 1939, the Soviet Union and Germany signed a ten-year non-aggression pact, called the Molotov–Ribbentrop pact. The pact contained a secret protocol by which the states of Northern and Eastern Europe were divided into German and Soviet "spheres of influence". In the north, Finland, Estonia and Latvia were assigned to the Soviet sphere. Poland was to be partitioned in the event of its "political rearrangement"—the areas east of the Narev, Vistula and San Rivers going to the Soviet Union while Germany would occupy the west. Lithuania, adjacent to East Prussia, would be in the German sphere of influence, although a second secret protocol agreed in September 1939 assigned the majority of Lithuanian territory to the Soviet Union. According to this secret protocol, Lithuania would regain its historical capital Vilnius, previously subjugated during the inter-war period by Poland.

Following the end of Soviet invasion of Poland on 6 October, the Soviets pressured Finland and the Baltic states to conclude mutual assistance treaties. The Soviets questioned the neutrality of Estonia after the escape of an interned Polish submarine on 18 September. A week later on 24 September, the Estonian foreign minister was given an ultimatum in Moscow. The Soviets demanded the conclusion of a treaty of mutual assistance to establish military bases in Estonia. The Estonians had no choice but to accept naval, air and army bases on two Estonian islands and at the port of Paldiski. The corresponding agreement was signed on 28 September 1939. Latvia followed on 5 October 1939 and Lithuania shortly thereafter, on 10 October 1939. The agreements permitted the Soviet Union to establish military bases on the Baltic states' territory for the duration of the European war and to station 25,000 Soviet soldiers in Estonia, 30,000 in Latvia and 20,000 in Lithuania from October 1939.