Security personnel guard the entrance of a road leading to a trail on Mount Ontake in Nagano prefecture Tuesday, three days after the volcano erupted in central Japan. Jiji Press/AFP/Getty Images hide caption

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A photo taken from a Kyodo News helicopter shows Japan's Self-Defense Forces personnel rescuing climbers who were in critical condition near the top of Mt. Ontake Monday, before rescue operations were suspended. Kyodo /Landov hide caption

itoggle caption Kyodo /Landov

The Japanese whaling ship Yushin Maru leaves Shimonoseki port in Yamaguchi Prefecture, southwestern Japan, last month. Japan's prime minister says he wants to expand whaling operations after they were temporarily scaled back. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

President Obama speaks at a joint news conference with Japan's Prime Minister Shinzo Abe in Tokyo on Thursday. Obama reinforced the U.S.-Japan security commitment. Junko Kimura-Matsumoto/AP hide caption

itoggle caption Junko Kimura-Matsumoto/AP

President Obama shakes hands with Japanese Prime Minister Shinzo Abe before a private dinner at Sukiyabashi Jiro in Tokyo on Wednesday. At Sukiyabashi Jiro, people pay a minimum of $300 for 20 pieces of sushi chosen by the patron, Jiro Ono. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images

Japanese Prime Minister Shinzo Abe speaks to reporters after inspecting a maglev train system at the Yamanashi Experiment Center in Tsuru Saturday. Japan is reportedly willing to send the technology to the U.S. without a fee. Kazuhiro Nogi/AP hide caption

itoggle caption Kazuhiro Nogi/AP

Packs of whale meat are seen in a specialty store in Tokyo last week. An international court ruled Monday that Japan must stop issuing permits to hunt whales in the Antarctic. Shizuo Kambayashi/AP hide caption

itoggle caption Shizuo Kambayashi/AP