(born 1962 in Kyoto) is a former Lieutenant Commander in the Maritime Self-Defense Force of Japan. He was found guilty of selling military secrets to Russia. Hagisaki worked at the National Institute for Defense Studies. He was arrested on September 8, 2000 while meeting a Russian military attaché, Captain Viktor Bogatenkov, at a Tokyo restaurant. Hagisaki then confessed to passing secret information to Bogatenkov. Bogatenkov himself cited diplomatic immunity, and left the country shortly afterwards. According to Japanese officials, Hagisaki met with Bogatenkov or other Russian agents on at least ten occasions, and gave them information on defence plans, communications, and United States military activities in Japan. The arrest came shortly after a visit to Japan by Russian leader Vladimir