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Japan's Emperor Akihito (L) waves next to Empress Michiko as they leave the memorial house of Vietnam's nationalist Phan Boi Chau (1867-1940) who campaigned for a strong relationship with Japan to gain Vietnam's independence, in the central city of Hue, Vietnam's former imperial city, on March 4, 2017. Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. / AFP PHOTO / POOL / HOANG DINH NAM (Photo credit should read HOANG DINH NAM/AFP/Getty Images)

Japan's Emperor Akihito (L) waves next to Empress Michiko as they leave the memorial house of Vietnam's nationalist Phan Boi Chau (1867-1940) who campaigned for a strong relationship with Japan to gain Vietnam's independence, in the central city of Hue, Vietnam's former imperial city, on March 4, 2017. Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. / AFP PHOTO / POOL / HOANG DINH NAM (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
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Japan's Emperor Akihito (L) and Empress Michiko (R) bow to bid farewell as they leave a tea ceremony hosted by Vietnam's Communist Party General Secretary Nguyen Phu Trong (back, 2-L) in Hanoi March 3, 2017. - The 83-year-old Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. (Photo by LUONG THAI LINH / POOL / AFP) (Photo credit should read LUONG THAI LINH/AFP/Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko (R) bow to bid farewell as they leave a tea ceremony hosted by Vietnam's Communist Party General Secretary Nguyen Phu Trong (back, 2-L) in Hanoi March 3, 2017. - The 83-year-old Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. (Photo by LUONG THAI LINH / POOL / AFP) (Photo credit should read LUONG THAI LINH/AFP/Getty Images)
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Japan's Emperor Akihito (L) and Empress Michiko (back, right) bow to bid farewell as they leave a tea ceremony hosted by Vietnam's Communist Party General Secretary Nguyen Phu Trong (front-R) in Hanoi March 3, 2017. The 83-year-old Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. / AFP PHOTO / POOL / LUONG THAI LINH (Photo credit should read LUONG THAI LINH/AFP via Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko (back, right) bow to bid farewell as they leave a tea ceremony hosted by Vietnam's Communist Party General Secretary Nguyen Phu Trong (front-R) in Hanoi March 3, 2017. The 83-year-old Japanese emperor Akihito and his wife, Michiko, are on their first visit to Vietnam, the latest in a series of trips to former battlegrounds. / AFP PHOTO / POOL / LUONG THAI LINH (Photo credit should read LUONG THAI LINH/AFP via Getty Images)
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Japan's Emperor Akihito (L) and Empress Michiko bow to bid farewell as they depart from the Phu Bai airport in the central city of Hue for Thailand, ending their six-day long royal visit in the Southeast communist country on March 5, 2017. / AFP PHOTO / POOL / Nam HOANG DINH AND HOANG DINH NAM (Photo credit should read NAM HOANG DINH,HOANG DINH NAM/AFP via Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko bow to bid farewell as they depart from the Phu Bai airport in the central city of Hue for Thailand, ending their six-day long royal visit in the Southeast communist country on March 5, 2017. / AFP PHOTO / POOL / Nam HOANG DINH AND HOANG DINH NAM (Photo credit should read NAM HOANG DINH,HOANG DINH NAM/AFP via Getty Images)
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Japan's Emperor Akihito (L) and Empress Michiko wave to bid farewell as they depart from the Phu Bai airport in the central city of Hue for Thailand, ending their six-day long royal visit in the Southeast communist country on March 5, 2017. / AFP PHOTO / POOL / Nam HOANG DINH AND HOANG DINH NAM (Photo credit should read NAM HOANG DINH,HOANG DINH NAM/AFP/Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko wave to bid farewell as they depart from the Phu Bai airport in the central city of Hue for Thailand, ending their six-day long royal visit in the Southeast communist country on March 5, 2017. / AFP PHOTO / POOL / Nam HOANG DINH AND HOANG DINH NAM (Photo credit should read NAM HOANG DINH,HOANG DINH NAM/AFP/Getty Images)
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