Former Assistant Chief Cabinet Secretary Nobukatsu Kanehara said Japan should allow nuclear-armed ships to dock in its ports to help deter China [1, 2].
The proposal suggests a fundamental shift in Japan's long-standing security posture. For decades, Tokyo has maintained a strict principle prohibiting the entry of nuclear weapons into its territory, a policy rooted in its identity as the only nation to suffer nuclear attacks.
Kanehara said revising this principle is necessary to address current regional security threats [1, 2]. He said the presence of nuclear-armed vessels during port calls would serve as a strategic deterrent against Chinese aggression [1, 2].
This perspective comes amid increasing tensions in the Indo-Pacific region. While the Japanese government has not officially changed its stance on nuclear entry, the suggestion from a former high-ranking official highlights an internal debate regarding the efficacy of the current non-nuclear policy.
The proposed change would likely involve coordinating with allies, particularly the U.S., whose naval fleet includes nuclear-capable assets. Such a move would represent a significant departure from the norms that have governed Japanese ports since the end of World War II [1, 2].
Kanehara said traditional deterrence methods may no longer be sufficient to ensure national security in the face of China's growing military capabilities [1, 2].
“Japan should revise the principle that prohibits the entry of nuclear weapons into Japan.”
This proposal signals a growing tension between Japan's historical commitment to a non-nuclear identity and the pragmatic demands of modern geopolitical deterrence. If adopted, such a policy change would likely provoke a diplomatic response from Beijing and could alter the security architecture of East Asia by formally integrating nuclear deterrence into Japan's territorial defense strategy.
