In 2024, Sanae Takaichi, former Secretary-General of Japan’s Liberal Democratic Party and current Minister in charge of Economic Security, publicly mentioned for the first time the possibility of Japan acquiring nuclear-powered submarines—a statement that drew significant domestic and international attention. She argued that, given the increasingly tense regional security environment, Japan should seriously consider all defense options, including nuclear-powered submarines, to enhance its maritime deterrence capabilities. Although she clarified that this does not imply pursuing nuclear weapons but rather focuses on nuclear propulsion technology, her remarks still touched a sensitive nerve regarding Japan’s long-standing ‘Three Non-Nuclear Principles.’As a prominent conservative figure who consistently advocates for strengthening national defense and revising Japan’s pacifist constitution, Takaichi’s comments are widely seen as an attempt to gauge public tolerance for moving beyond traditional security constraints. Notably, the Japanese government’s official stance still rules out possessing offensive nuclear submarines, and both legal frameworks and public opinion remain highly cautious about anything nuclear-related. Experts point out that even discussing nuclear-powered submarines faces major hurdles, including technological dependence (likely requiring U.S. or U.K. support), enormous costs, and strong public opposition.This move reflects efforts by certain political factions in Japan to reassess national defense strategy amid intensifying U.S.-China strategic competition. However, without broad consensus or a solid legal foundation, such proposals are unlikely to translate into actual policy in the near term.
2024年，日本自民党前干事长、现任经济安全保障担当大臣高市早苗在一次公开演讲中首次直接提及“引进核潜艇”的可能性，引发国内外广泛关注。她表示，在当前地缘安全环境日益严峻的背景下，日本应认真探讨包括核动力潜艇在内的所有防卫选项，以强化海上威慑力。尽管她强调这并非主张发展核武器，而是聚焦于核动力推进技术，但此言论仍触及日本长期坚持的“非核三原则”敏感神经。高市早苗作为日本政坛右翼代表人物，一贯主张强化国防、修改和平宪法。她此次表态被解读为试探舆论对突破传统安全政策边界的接受度。值得注意的是，日本政府目前官方立场仍排除拥有攻击性核潜艇，且国内法律与民意对核相关议题高度谨慎。专家指出，即便仅讨论核动力潜艇，也面临技术依赖（如需美英支持）、巨额成本及公众反对等多重障碍。此举反映出日本部分政治力量试图在中美战略竞争加剧的背景下，重新评估国家防卫战略。然而，在缺乏广泛共识和法律基础的情况下，此类提议短期内难以转化为实际政策。
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