However, the ambiguous attitude of the Central Powers on Greek issues during the Great War, led France and Italy to the joint occupation of Epirus in September 1916. At the end of World War I, however, the Agreement of Titoni with Venizelos foresaw the annexation of the region to Greece. Eventually, Greece's military involvement with Mustafa Kemal's Turkey worked in the interest of Albania, which permanently annexed the region on November 9, 1920.