US President Barack Obama (4th L) holds official talks with Vietnam's Prime Minister Nguyen Xuan Phuc (3rd R) at Phuc's cabinet office in Hanoi on May 23, 2016. Obama praised "strengthening ties" between the United States and Vietnam at the start of a landmark visit on May 23, as the former wartime foes deepen trade links and share concerns over Chinese actions in disputed seas. / AFP / POOL / HOANG DINH NAM (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
