Chinese President Xi Jinping's special envoy and Vice Premier Wang Yang addresses a ceremony to mark the 50th anniversary of the founding of the Organization for African Unity (OAU), in Addis Ababa, Ethiopia, May 25, 2013. (Xinhua/Meng Chenguang)

Hailemariam Desalegn, Ethiopian prime minister and current African Union chairperson, addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)

Kenyan President Uhuru Kenyatta addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)

European Commission President Jose Manuel Barroso addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Meng Chenguang)

French President Francois Hollande addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Meng Chenguang)

Former President of Zambia Kenneth Kaunda addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Meng Chenguang)

Hailemariam Desalegn, Ethiopian prime minister and current African Union chairperson, addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Meng Chenguang)

Uganda President Yoweri Museveni addresses the ceremony to mark the 50th anniversary of the founding of the African Union, the successor of the Organisation of African Unity (OAU), in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Meng Chenguang)

Brazilian President Dilma Vana Rousseff addresses the ceremony to mark the 50th anniversary of the founding of the African Union, in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)

Brazilian President Dilma Vana Rousseff addresses the ceremony to mark the 50th anniversary of the founding of the African Union, in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)

African Union (AU) Chairperson Nkosazana Dlamini-Zuma addresses the ceremony to mark the 50th anniversary of the founding of the African Union, in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)

African Union (AU) Chairperson Nkosazana Dlamini-Zuma addresses the ceremony to mark the 50th anniversary of the founding of the African Union, in Addis Ababa, Ethiopia, on May 25, 2013. (Xinhua/Zhang Chen)