see more

Japan's Deputy Chief Cabinet Secretary Koichi Hagiuda (R) and US Energy Secretary Ernest Moniz (L) speak during a press conference at the 2016 Nuclear Security Summit in Washington, DC, April 1, 2016. / AFP / Jim Watson (Photo credit should read JIM WATSON/AFP/Getty Images)

Japan's Deputy Chief Cabinet Secretary Koichi Hagiuda (R) and US Energy Secretary Ernest Moniz (L) speak during a press conference at the 2016 Nuclear Security Summit in Washington, DC, April 1, 2016. / AFP / Jim Watson        (Photo credit should read JIM WATSON/AFP/Getty Images)