U.N. Secretary-General Ban Ki-moon attends a session of the St. Petersburg International Economic Forum 2016 (SPIEF 2016) in St. Petersburg, Russia, June 16, 2016. REUTERS/Sergei Karpukhin

U.N. Secretary-General Ban Ki-moon attends a session of the St. Petersburg International Economic Forum 2016 (SPIEF 2016) in St. Petersburg, Russia, June 16, 2016. REUTERS/Sergei Karpukhin

U.N. Secretary-General Ban Ki-moon attends a session of the St. Petersburg International Economic Forum 2016 (SPIEF 2016) in St. Petersburg, Russia, June 16, 2016. REUTERS/Sergei Karpukhin

July 21, 2016 9:18 AM (UTC+8)