the Japanese Diet. In January 2010, the defense minister ordered the JMSDF to return from the Indian Ocean, fulfilling a government pledge to end the eight-year refueling mission. Prime Minister Yukio Hatoyama refused to renew the law authorizing the mission, ignoring requests from the American government for continuation. Both the Western alliance country typified by the Royal Australian Navy and the Royal Danish Navy, doing friendship activities in the Indian Ocean. Mission in Somalia In May 2010, Japan announced its intention to build a permanent naval base in Djibouti, from which it will conduct operations to protect merchant shipping from Somali pirates. Military exercises and exchanges The JMSDF and the U.S. Navy frequently carry out joint exercises and "U.S. Navy officials have claimed that they have a closer daily relationship with the JMSDF than any other navy in the world". The JMSDF participates in RIMPAC, the annual multi-national military exercise near Hawaii that has been hosted by the U.S. Navy since 1980. The JMSDF dispatched a ship to the Russian Vladivostok harbor in July 1996 to participate in the Russian Navy's 300th Anniversary Naval Review. In return, Admiral Vinogradov, an , called at Tokyo Bay in June 1997. The JMSDF has also conducted joint naval exercises with the Indian Navy. RIMPAC: Japan Maritime Self-Defense Force participated in RIMPAC after 1980. Pacific Shield (PSI): The Japan Maritime Self-Defense Force has participated in Pacific Shield after 2004; and in 2007, the Japan Maritime Self-Defense Force hosted the exercise. Pacific Reach: The Japan Maritime Self-Defense Force has participated in the bi-annual submarine rescue exercise since 2000. In 2002, the Japan Maritime Self-Defense Force hosted the exercise. Navy to Navy Talks: The Japan Maritime Self-Defense Force holds regular naval conferences with its counterparts of Indonesia, Malaysia, Australia, the United Kingdom, and the United States of America. AEGIS Ballistic Missile Defense FTM: The Japan Maritime Self-Defense Force has participated in the FTM after FTM-10. The Japan Maritime Self-Defense Force carried out JFTM-1 in December 2007. The Japan Maritime Self-Defense Force participates in the United States Navy's Personnel Exchange Program (PEP) in which officers and enlisted personnel from each country serve fully integrated into the other country's navy for two years. Keen Sword is the biggest biennial military exercise around Japan. The participants are primarily Japan and the United States. Equipment Ships and submarines The ship prefix JDS (Japanese Defense Ship) was used until 2008, at