though they were not made law. Eisaku Satō was presented with the Nobel Peace Prize in 1974, in large part for his work toward Japan's entry into the NPT. In his Nobel Lecture (on the seventh anniversary of his original statement to the Diet), Satō reiterated and discussed the Three Non-Nuclear Principles and expressed hope and confidence that future governments would adopt them as well. Every Prime Minister of Japan since Satō has publicly reaffirmed the Three Non-Nuclear Principles. However, Japanese government-sponsored studies have been carried out in the past—and are suspected by many to be ongoing—to assess the feasibility of developing a nuclear weapons program. In recent years public officials and nuclearization advocates have been unprecedentedly vocal in questioning the principles, but the public remains committed to them. See also Japan's non-nuclear weapons policy Japanese nuclear weapon program Nuclear latency Nuclear umbrella References Eisaku Satō's Nobel Lecture, 11 December 1974. "Non-nuclear principles to be reviewed". Chūgoku Shimbun Peace News, 2 June 2002. Campbell, Kurt M. and Sunohara, Tsuyoshi (2004). "Japan: Thinking the Unthinkable". The Nuclear Tipping Point: Why States Reconsider Their Nuclear Choices Ch. 9: 218–253. Address by Prime Minister Junichiro Koizumi at the Hiroshima Memorial Service, 6 August 2005. Nuclear weapons policy Nuclear technology in Japan Politics of Post-war Japan Foreign relations of Post-war Japan Japanese defence policies