Signing the mutual aid pact

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28. September 1939

Estonia and the Soviet Union signed a mutual aid pact in Moscow, that was to last for 10 years. In theory, it based on the Peace Treaty of Tartu and the non-aggression pact between Estonia and Soviet Union, signed on May 4, 1932.
Both sides promised to help each other in case of an attack from a third party. Soviet Union was obliged to supply Estonia with weapons and other military equipment, with favorable prices. Estonia allowed the Soviet army to establish naval- and airbases in Saaremaa Island, Hiiumaa Island and Paldiski town.

According to the confidential section of the pact, up to 25,000 soldiers could be brought into Estonia.
On the same day, Germany and the Soviet Union signed a friendship- and border treaty, which specified Poland's division and added Lithuania to the Soviet sphere of interest. The Soviet Union made similar deals with Latvia and Lithuania, on October 5 and 10 respectively.

Source: Eesti ajalugu. VI, Vabadussõjast taasiseseisvumiseni. Tartu: Ilmamaa, 2005
Eesti ajaloo atlas. Tallinn: Avita, 2006. 

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