Subway passengers affected by the sarin gas attack on Tokyo's subway system are carried into St. Luke's International Hospital in Tokyo on March 20, 1995. Thirteen people were killed and more than 6,000 injured in the attack, which was carried out by the Aum Shinrikyo cult. Chikumo Chiaki/AP hide caption

itoggle caption Chikumo Chiaki/AP

Japan's new warship, the Izumo, draws a crowd for its launch ceremony at the port in Yokohama Tuesday. At 248 meters (814 feet) in length, the flat-topped ship has been called a destroyer, or a helicopter carrier. Toshifumi Kitamura/AFP/Getty Images hide caption

itoggle caption Toshifumi Kitamura/AFP/Getty Images

Tokyo Electric Power Co (TEPCO) workers work on waste water tanks at Japan's Fukushima Daiichi nuclear plant in the town of Okuma, Fukushima prefecture in Japan on June 12, 2013. Noboru Hashimoto /AFP/Getty Images hide caption

itoggle caption Noboru Hashimoto /AFP/Getty Images

Train passengers and railway staff tilted a train car to one side as they rescued a woman Monday at a station near Tokyo. She had fallen between a the car and the platform. The woman was not seriously injured. Norihiro Shigeta/Yomiuri Shimbun/AP hide caption

itoggle caption Norihiro Shigeta/Yomiuri Shimbun/AP

Japanese Prime Minister Shinzo Abe delivers a speech Sunday in Tokyo as Emperor Akihito, third from right, and Empress Michiko, second from right, listen during a ceremony marking the day Japan recovered its sovereignty under the San Francisco Peace treaty in 1952. Itsuo Inouye/AP hide caption

itoggle caption Itsuo Inouye/AP

Japan's major opposition Liberal Democratic Party (LDP) Secretary-General Shigeru Ishiba adds a rosette on the name of one of those elected in parliamentary elections at the party headquarters in Tokyo on Sunday. Junji Kurokawa/AP hide caption

itoggle caption Junji Kurokawa/AP

Protesters marched in front of the Japanese Embassy in Beijing today. They carried a banner declaring: "We are proud of China's rise. We resolutely oppose Japan's rightist forces." Louisa Lim/NPR hide caption

itoggle caption Louisa Lim/NPR

Protesters march outside the Japanese Embassy in Beijing on Saturday. Tension escalated, sometimes to violence, in cities across China after Japan bought the disputed islands from a private Japanese owner. Louisa Lim/NPR hide caption

itoggle caption Louisa Lim/NPR