Egyptian President Abdel-Fattah al-Sisi (L) chats with Sudanese President Omar al-Bashir during a meeting in the Sudanese capital Khartoum on March 23, 2015 to sign the agreement of principles on Ethiopia's Grand Renaissance dam project. Egypt agreed to a preliminary deal with Ethiopia on a new dam project that Cairo feared would hamper the flow of the Nile, the river on which it depends. AFP PHOTO / ASHRAF SHAZLY        (Photo credit should read ASHRAF SHAZLY/AFP/Getty Images)