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Turkish Straits

On 24 July 1923, the Treaty of Lausanne included the Lausanne Straits Agreement. The Lausanne Straits Agreement stated that the Dardanelles should remain open to all commercial vessels: seizure of foreign military vessels was subject to certain limitations during peacetime, and, even as a neutral state, Turkey could not limit any military passage during wartime. The Lausanne Straits Agreement stated that the waterway was to be demilitarised and its management left to the Straits Commission. The demilitarised zone heavily restricted Turkey's domination and sovereignty over the Straits, and the defence of Istanbul was impossible without sovereignty over the water that passed through it.

In March 1936, Hitler's reoccupation of the Rhineland gave Atatürk the opportunity to resume full control over the Straits. "The situation in Europe", Atatürk declared "is highly appropriate for such a move. We shall certainly achieve it". Tevfik Rüştü Aras, Turkey's foreign minister, initiated a move to revise the Straits' regime. Aras claimed that he was directed by Atatürk, rather than the Prime Minister, İsmet İnönü. İnönü was worried about harming relations with Britain, France, and Balkan neighbors over the Straits. However, the signatories of the Treaty of Lausanne agreed to join the conference, since unlimited military passage had become unfavourable to Turkey with the changes in world politics. Atatürk demanded that the members of the Turkish Foreign Office devise a solution that would transfer full control of the waterway to Turkey.

On 20 July 1936, the Montreux Convention was signed by Bulgaria, Great Britain, Australia, France, Japan, Romania, the Soviet Union, Turkey, Yugoslavia and Greece. It became the primary instrument governing the passage of commercial and war vessels through the Dardanelles Strait. The agreement was ratified by the GNAT on 31 July 1936 and went into effect on 9 November 1936.