Sykes–Picot Agreement
The Arab Revolt was launched on June5th, 1916, on the basis of the "quid pro quo" agreement in the correspondence. However, less than three weeks earlier the governments of the United Kingdom, France, and Russia secretly concluded the Sykes–Picot Agreement, which Balfour described later as a "wholly new method" for dividing the region, after the 1915 agreement "seems to have been forgotten".