继一位日本高级官员建议日本考虑获取核武器，以及政府随后重申其非核原则后，美国国务院于12月20日称赞日本为非扩散领导者，同时强调美国核威慑以保护包括日本在内的盟友。
美国的回应是在由未具名的首相高市早苗顾问引发的辩论升温之际，该顾问关于拥有核武器的个人意见于12月19日被报道，促使日本内阁官房长官重申三项非核原则。
国务院发言人在发给《日本时报》的电子邮件中回避了对这些言论的直接评论，称：“日本是核不扩散和推进核军控方面的全球领导者和美国的重要伙伴。”美国重申其《国家安全战略》承诺：“美国将维持世界上最强大、最可靠和最现代化的核威慑，以保护美国及其盟友，包括日本。”
这一立场反映了美日联盟的细微动态，日本尽管面临中国和朝鲜的地区威胁引发此类讨论，但仍是关键的非扩散伙伴。从历史上看，日本一直遵守其战后非核原则和《不扩散核武器条约》，尽管地缘政治压力重新点燃了关于威慑选项的辩论。
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Japan has revised its long-standing rules on lethal arms exports, prompting Chinese warnings of resurgent militarism amid heightened bilateral tensions.
Japan's UN representative firmly rebutted China's accusation that Tokyo is seeking to host nuclear weapons from allies, reaffirming its non-nuclear principles amid ongoing debates sparked by Prime Minister Sanae Takaichi's security policies. The exchange at the NPT discussions in New York underscores escalating tensions with Beijing.
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Japan and the United States held regular talks on the U.S. "nuclear umbrella," with discussions also focusing on China's "destabilizing nuclear weapons buildup and testing." The Extended Deterrence Dialogue (EDD) occurred amid growing tensions between the allies and China over Beijing's efforts to expand and modernize its nuclear arsenal.
South Korea's Foreign Minister Cho Hyun met IAEA Director General Rafael Mariano Grossi in Seoul on April 15 to discuss Seoul's nuclear-powered submarine program—stemming from last year's summits with the United States—and North Korea's nuclear activities. Cho reaffirmed commitment to Nuclear Non-Proliferation Treaty (NPT) obligations, earning Grossi's praise for South Korea's 'full and unambiguous' nonproliferation efforts.
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U.S. and Israeli forces attacked Iran over the weekend in a massive assault that killed Ayatollah Ali Khamenei, the nation's supreme leader for nearly four decades. This triggered retaliatory strikes in the Middle East, prompting Japanese police to bolster security at U.S. and Israel-related facilities. Stock markets in Tokyo opened lower, and Bank of Japan Deputy Governor Ryozo Himino stressed the need to monitor the situation.