Consequences of the Great War: Treaty of Lausanne, July 24, 1923 The Treaty of Lausanne (French, Traite de Lausanne) was a peace treaty that established the borders of modern Turkey. It was signed in the Swiss city of Lausanne on July 24, 1923 between the governments of Greece, Turkey and the Allied Nations of World War I and is considered part of the partition of the Ottoman Empire. The Treaty defined the European borders of Greece, Bulgaria and Turkey. It officially ended all Turkish sovereignty over the Dodecanese Islands (Article 15), which were formally occupied by Italy, Cyprus (Article 20), Egypt and Sudan (Article 17), Syria and Iraq (Article 3). Kurdistan territories were divided between several countries, and Armenia was divided between the new Turkish state and the Soviet Union. As far as 1991, after the dissolution of the USSR, the eastern end of Armenia would become an independent country. Turkish borders with Saudi Arabia and Yemen were controlled by Turkish troops until ...