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US President Barack Obama and Japanese Prime Minister Shinzo Abe attend official welcoming ceremonies on the South Lawn of the White House in Washington, DC, April 28, 2015.

Mandel Ngan/AFP

US President Barack Obama and Japanese Prime Minister Shinzo Abe attend official welcoming ceremonies on the South Lawn of the White House in Washington, DC on Tuesday

Shinto priests walk out from Torii gate after they administer a Shinto rite "Kiyoharai" on the first day of the four-day autumn festival at the Yasukuni shrine in Tokyo on October 17, 2013. Japanese Prime Minister Shinzo Abe has donated a symbolic gift to the controversial Yasukuni war shrine, an apparent sign that he will avoid a visit that would have angered China and South Korea.

Yoshikazu Tsuno/AFP

Shinto priests leave the Torii gate of the Yasukuni shrine in Tokyo, after administering the rite of Kiyoharai on the first day of the four-day autumn festival, on Thursday. Japanese prime minister Shinzo Abe has donated a symbolic gift to the controversial war shrine, an apparent sign that he will avoid a visit that would have angered China and South Korea.