In this Friday, May 9, 2014 image made from video, South Sudan’s President Salva Kiir, center left, and rebel leader Riek Machar, center right, exchanging signed documents in Addis Ababa, Ethiopia. The South Sudan’s president has reached a cease-fire agreement with the rebel leader, an African regional bloc said Friday, after a vicious cycle of revenge killings drew international alarm. (AP Photo/AP Video)