US President Barack Obama (C) walks with his Vietnamese counterpart Tran Dai Quang (L) as they review a guard of honour during a welcoming ceremony at the Presidential Palace in Hanoi on May 23, 2016. Obama was to meet communist Vietnam's senior leaders on May 23, kicking off a landmark visit that caps two decades of post-war rapprochement, as both countries look to push trade and check Beijing's growing assertiveness in the South China Sea. / AFP / POOL / KHAM (Photo credit should read KHAM/AFP/Getty Images)
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