Soviet–Estonian Mutual Assistance Treaty

The Soviet–Estonian Mutual Assistance Treaty (Estonian: Eesti Vabariigi ja NSV Liidu vaheline vastastikuse abistamise pakt, Russian: Пакт о взаимопомощи между СССР и Эстонией, romanized: Pakt o vzaimopomoshchi mezhdu SSSR i Estoniyey), also known as the Bases Treaty (Estonian: baaside leping) was a bilateral treaty between the Soviet Union and Estonia, signed in Moscow on 28 September 1939.

The treaty obliged both parties to respect each other's sovereignty and independence, and allowed the Soviet government to establish military bases in Estonia.

After occupying eastern Poland, the Soviets pressured Finland and the Baltic states to conclude mutual assistance treaties.

The Soviets demanded the conclusion of a treaty of mutual assistance which included the establishment of military bases in Estonia.

During October 1939, the Soviet government began stationing troops in Estonia in numbers exceeding the Estonian armed forces.