In September 1939, the Soviet Union presented Estonia with an ultimatum: to allow the Soviet Union to position its military forces on Estonian territory and to conclude a Treaty on Military Bases.
28. 1939年9月，苏维埃联盟向爱沙尼亚提出最后通牒：允许苏维埃联盟在爱沙尼亚领土上驻军，并缔结一项《军事基地条约》。