Accra, Jan. 28, GNA - President John Evans Atta Mills, left Accra today for Addis Ababa, Ethiopia, to attend the 16th Ordinary Session of the African Union. The session takes place from the 25th to 31st January, 2011. President Mills is expected to deliver the key note address for the session which would be on the theme: "Shared Values in Africa." The President is expected back on Tuesday, February 1st, 2011. At the airport to see him off was Vice President John Dramani Mahama, Ministers of State, and senior military and police personnel.