Local resident looks at the motorcade transporting U.S. President Barack Obama before an arrival ceremony at the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





U.S. President Barack Obama shakes hands with Vietnam's President Tran Dai Quang after an arrival ceremony at the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





Children look at the motorcade transporting U.S. President Barack Obama before an arrival ceremony at the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





A limousine transporting U.S. President Barack Obama arrives for a welcoming ceremony at the Presidential Palace in Hanoi, Vietnam May 23, 2016. (Photo by Reuters/Kham)





U.S. President Barack Obama and Vietnam's President Tran Dai Quang walk after an arrival ceremony at the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





U.S. President Barack Obama walks with Vietnam's National Assembly Chairwoman Nguyen Thi Kim Ngan during a visit at the gardens of the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





Women pose for a picture next to U.S. President Barack Obama's limousine as a secret service officer asks them to move during Obama's visit at the gardens of the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





U.S. President Barack Obama attends a news conference with Vietnam's President Tran Dai Quang at the Presidential Palace Compound in Hanoi, Vietnam, May 23, 2016. (Photo by Carlos Barria/Reuters)





Vietnamese security officers pose next to U.S. President Brack Obama's limousine at the Presidential Palace when Obama holds official talks with his Vietnamese counterpart Tran Dai Quang in Hanoi, Vietnam on May 23, 2016. (Photo by Hoang Dinh Nam/Reuters)





U.S. Secretary of State John Kerry (2nd R) talks with his Vietnamese counterpart Pham Binh Minh (R) as they wait for the arrival of U.S. President Barack Obama for a welcoming ceremony at the Presidential Palace in Hanoi, Vietnam May 23, 2016. (Photo by Hoang Dinh Nam/Reuters)





U.S. President Barack Obama (L) and Vietnam's National Assembly Chairwoman Nguyen Thi Kim Ngan feed fish in a pond, in the gardens of the presidential palace in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





U.S. President Barack Obama reviews the guard of honour during welcoming ceremony at the Presidential Palace in Hanoi, Vietnam May 23, 2016. (Photo by Reuters/Kham)





Children wave Vietnamese and American flags while waiting for arrival of U.S. President Barack Obama (not pictured) before a welcoming ceremony at the Presidential Palace in Hanoi, Vietnam May 23, 2016. (Photo by Reuters/Kham)





A statue of Vietnamese revolutionary leader Ho Chi Minh is seen inside a room at the at the Presidential Palace Compound during U.S. President Barack Obama state visit to Vietnam in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





U.S. President Barack Obama attends a press conference with Vietnam's President Tran Dai Quang at the Presidential Palace Compound in Hanoi, Vietnam May 23, 2016. (Photo by Carlos Barria/Reuters)





President Barack Obama greets women at the door as he walks from the Bún chả Hương Liên restaurant after having dinner with American Chef Anthony Bourdain in Hanoi, Vietnam, Monday, May 23, 2016. (Photo by Carolyn Kaster/AP Photo)





President Barack Obama winks as he arrives for a news conference with Vietnamese President Tran Dai Quang, Monday, May 23, 2016, at the International Convention Center in Hanoi, Vietnam. (Photo by Carolyn Kaster/AP Photo)





US President Barack Obama (C-L) and Vietnam's President Tran Dai Quang (C-R) review an honor guard at the Presidential Palace in Hanoi, Vietnam, 23 May 2016. US President Barack Obama visits Vietnam for the first time from 23 to 25 May 2016, making him the third US President to visit the South East Asian country since the end of the Vietnam War in 1975. During the first day of his visit Obama announced that the US will lift its arms embargo on weapon sales to Vietnam. (Photo by Minh Hoang/EPA)