North Korea warns against Japan's nuclear ambitions amid reaffirmation of non-nuclear policy

North Korea vowed on December 21 to prevent Japan's nuclear ambitions 'at any cost,' reacting to an unnamed Tokyo official's suggestion of acquiring atomic weapons—a comment that prompted Japan to reaffirm its non-nuclear principles two days earlier. The exchange highlights escalating tensions between the two nations.

Following Japan's government reaffirmation of its three non-nuclear principles on December 19—after a senior official from Prime Minister Sanae Takaichi's office suggested acquiring nuclear weapons for deterrence—North Korea issued a stark warning on December 21. Pyongyang declared that Japan's nuclear ambitions must be stopped at any cost, citing Kyodo News reports quoting the unnamed security policy official as saying, 'I think we should possess nuclear weapons.'

This response underscores deep strains in North Korea-Japan relations, fueled by historical grievances, recent North Korean missile tests, and nuclear advancements. Japan, the only nation to suffer atomic bombings in 1945, has long upheld its non-nuclear stance amid threats from nuclear-armed neighbors including North Korea, China, and Russia.

Analysts warn that North Korea's rhetoric could further destabilize the region and challenge global non-proliferation efforts, though no specific actions were outlined. The incident reflects broader debates in Japan on defense strategies amid doubts over U.S. alliances.

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Illustration depicting North Korea's warning of a nuclear domino effect following US approval of South Korea's nuclear-powered submarines.
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North Korea warns of nuclear domino from US-South Korea submarine approval

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North Korea denounced on Tuesday the United States' approval of South Korea's nuclear-powered submarine push, warning it would trigger a 'nuclear domino' in the region. This marks Pyongyang's first response to the joint fact sheet released last Friday on outcomes from summits between the two allies' leaders. North Korea labeled the document as formalizing a confrontational stance and vowed countermeasures.

Japan's government reaffirmed its decades-old pledge against possessing nuclear weapons on Friday following remarks by a senior official suggesting acquisition for deterrence. Opposition parties called for the official's dismissal, while the government stressed commitment to the three non-nuclear principles.

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Following initial government reaffirmation of Japan's non-nuclear principles, off-record remarks by a senior national security official suggesting nuclear possession have drawn sharp international condemnation from China and North Korea, while domestic media remains divided, with the Tokyo Shimbun labeling them 'reckless.'

Chinese Foreign Ministry Spokesperson Mao Ning warned on Tuesday at a regular press conference that the international community must stay alert to Japan's accelerating remilitarization trend, which threatens regional peace and stability. Japanese Prime Minister Sanae Takaichi stated at a New Year's press conference that Japan will discuss revising its three national security documents by year's end, including boosting defense spending and developing offensive capabilities.

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At the Ninth Congress of the Workers' Party of Korea, leader Kim Jong-un declared that North Korea would redouble efforts to increase the number of nuclear weapons and expand their deployment means and scope. He adopted a hostile tone toward South Korea, branding it the 'most hostile entity,' while leaving conditional overtures for diplomacy with the United States. This dual-track approach underscores Pyongyang's focus on bolstering its nuclear capabilities amid regional tensions.

North Korea launched at least two ballistic missiles on Sunday, January 4, 2026. Japan's Defense Ministry reported that the missiles flew on irregular trajectories for 900 km and 950 km, placing a large section of southern Japan within striking distance. Japan is coordinating closely with the United States and South Korea in response.

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US and Israeli strikes on Iran underscore America's stance on North Korea's nuclear program, signaling to Pyongyang that nuclear weapons may not guarantee security. Under Secretary of Defense for Policy Elbridge Colby stated the Trump administration is 'well aware' of the issue. Experts analyze the event as making decapitation threats more real for North Korea.

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