ArticlesFrom the Potomac to the EuphratesWeekend Reading: Drones, Graffiti, and La Volte-FaceShareYemenWeekend Reading: Drones, Graffiti, and La Volte-FaceBy experts and staffPublishedJuly 22, 2011 6:00 p.m.Steven A. CookCFR ExpertEni Enrico Mattei Senior Fellow for Middle East and Africa StudiesShareTribesmen loyal to Yemeni opposition tribal chief Sheikh Sadiq al-Ahmar guard outside al-Ahmar’s headquarters in Sanaa (Suhaib Salem/Courtesy Reuters)