sentences:  The Soviet Union now occupied just over half of all Polish territory, and the Allied powers had demonstrated themselves incapable of military intervention on the Eastern front.There were no impediments remaining to Stalin, in concert with Hitler, achieving his aims in the Baltics.On September 24, 1939, warships of the Red Navy appeared off Latvia's northern neighbour, Estonian ports, Soviet bombers began a threatening patrol over Tallinn and the nearby countryside.