In this May 13, 2013, photo, Osaka Mayor Toru Hashimoto answers reporters' questions at the Osaka city office in Osaka, western Japan. Osaka's outspoken mayor has said the system in which Asian women were forced to become wartime prostitutes before and during World War II was necessary to "maintain discipline" in the Japanese military. (AP Photo/Kyodo News)
In this May 13, 2013, photo, Osaka Mayor Toru Hashimoto answers reporters' questions at the Osaka city office in Osaka, western Japan. Osaka's outspoken mayor has said the system in which Asian women were forced to become wartime prostitutes before and during World War II was necessary to "maintain discipline" in the Japanese military. (AP Photo/Kyodo News)
Russian President Vladimir Putin shakes hands with Japanese Prime Minister Shinzo Abe during a meeting in Moscow on Monday. It was the first Russian visit by a Japanese prime minister in 10 years. (Associated Press)
Russian President Vladimir Putin shakes hands with Japanese Prime Minister Shinzo Abe during a meeting in Moscow on Monday. It was the first Russian visit by a Japanese prime minister in 10 years. (Associated Press)
A Boeing 787 "Dreamliner" aircraft belonging to Japan's All Nippon Airways, takes off from Haneda Airport in Tokyo at the start of a test flight on Sunday, April 28, 2013. (AP Photo/Kyodo News)
A Boeing 787 "Dreamliner" aircraft belonging to Japan's All Nippon Airways, takes off from Haneda Airport in Tokyo at the start of a test flight on Sunday, April 28, 2013. (AP Photo/Kyodo News)
A mushroom cloud rises moments after the atomic bomb was dropped on Nagasaki, Japan, Aug. 9, 1945.
A mushroom cloud rises moments after the atomic bomb was dropped on Nagasaki, Japan, Aug. 9, 1945.
U.S. Secretary of State John Kerry waves to the crowd as he enters the auditorium to deliver a policy speech on the 21st Century Pacific Partnership at Tokyo Institute of Technology in Tokyo, Japan, Monday, April 15, 2013. Kerry is in Tokyo as part of Asian tour amid a tense situation over a possible missile launch by North Korea. (AP Photo/Paul J. Richards, Pool)
