Handout photo from Egypt's state-run news agency MENA shows that Egyptian President Abdel-Fattah al-Sisi (C), Zimbabwe's President Robert Mugabe (R) and Ethiopian Prime Minister Hailemariam Desalegn (L) sign documents at the Tripartite summit for the Common Market of Eastern and Southern Africa (COMESA), the East African Community (EAC) and the Southern African Development Community (SADC), held in Egypt's Red Sea resort city Sharm El-Sheikh, on June 10, 2015. Some 25 African nations signed an agreement on Wednesday to form the largest free trade area (FTA) on the black continent, integrating the three existing economic zones, Egyptian state-run MENA news agency reported. (Xinhua/MENA)