African Union Commission Chairperson Moussa Faki Mahamat (L front) signs a Memorandum of cooperation in the field of peace, security and governance with High Representative of the European Union for Foreign Affairs and Security Policy Federica Mogherini (R front) as European Commission President Jean-Claude Juncker (back) witnesses the signature after the 9th meeting of the European Commission and the African Union Commission in Brussels, Belgium, May 23, 2018. (Xinhua/Ye Pingfan)