In the Constantinople Agreement of March 18, 1915, Russian Foreign Minister Sergei Sazonov wrote to the ambassadors of France and Great Britain after the start of naval operations, before the Gallipoli campaign, and claimed Constantinople and the Dardanelles. During a series of five-week diplomatic talks, Britain and France agreed, under their own claims, on a wider sphere of influence in Iran in the case of Britain and on the annexation of Syria (including Palestine) and Cilicia for France. British and French claims agreed and all parties agreed that the proper management of the holy sites should be left to later regulation.  Without the Russian revolutions of 1917, Constantinople and The Strait could have been handed over to Russia after the Allied victory. In April 1920, the San Remo Conference distributed class A mandates on Syria to France and to Iraq and Palestine to Britain. The same conference ratified an oil deal reached at a London conference on 12 February on the basis of a slightly different version of the long-term berenger agreement, previously initialled on 21 December in London. In the chain of agreements between France, Russia and Britain, Russian claims were first approved: France confirmed its agreement on April 26 and Britain on May 23 with formal sanction on October 23. The Franco-English agreement was signed in an exchange of letters on 9 May and confirmed on 16 May.  The agreement was reached in secret, not least because it betrayed promises already made by the British government Hussein bin Ali, the Sharif of Mecca. During the war, in an effort to stir up an Arab rebellion against the Ottomans, the British sought to support Hussein by agreeing to support the creation of an independent Arab state with some reservations.
In the so-called McMahon-Hussein correspondence, Britain set out the conditions: it wanted to maintain rights in Baghdad and Basra and set aside parts of syria today, which it said were not entirely Arab. The Arabs did revolt against the Ottomans, with the help of British military officer T.E. Lawrence. But after the war, the British claimed that the correspondence was not a formal treaty, although Hussein and his family insisted. .