Constantinople Agreement

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The Constantinople Agreement (March 18, 1915) was a set of secret assurances made by the Triple Entente during World War I. France and Great Britain promised to give Constantinople (now Istanbul) and the Dardanelles (land on either coast in Thrace and Asia Minor), which at the time were occupied by the Ottoman Empire, to the Russians in the event of victory. The city of Constantinople was intended to be a free port.

It was never carried out due to the failure of the Dardanelles campaign and the threat Britain saw in Russia after the former finally reached the city in 1918. The agreement was revealed by the Bolsheviks in 1917, making public the British diplomatic intentions and encouraging the passing of the Balfour Declaration. Knowledge of the agreement was used by Kemal Ataturk to regain Constantinople for the Turkish Republic, risking war with the Allies.