"FILE- In this March 20, 2013, file photo provided by the Vatican paper L' Osservatore Romano, Pope Francis, right, meets Bartholomew I, the first ecumenical patriarch to attend the installation of a Pope since the Catholic and Orthodox church split nearly 1,000 years ago, at the Vatican. Pope Francis insists his weekend pilgrimage to the Middle East is a ""strictly religious"" commemoration of a key turning point in Catholic-Orthodox relations. But the three-day visit is the most delicate mission of his papacy and will test his diplomatic chops as he negotiates Israeli-Palestinian tensions and fallout from Syria's civil war. (AP Photo/Osservatore Romano, File)"