Cambodia and China began their annual Golden Dragon military exercise this week to strengthen cooperation and exchange military experiences, a Cambodian official said. Chinese and Cambodian soldiers marched during a drill in Svay Chok, Cambodia, on Thursday. The annual Golden Dragon exercises began in December 2016, shortly after Cambodia canceled similar exercises with the United States called Angkor Sentinel. China describes its friendship with Cambodia as "ironclad." (AP video/Ouk Navouth)