Japan Defense Minister Won't Rule Out Nuclear-Powered Submarines in Policy Review
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Summary
Japanese Defense Minister Koizumi Shinjiro announced on Friday that Japan will not exclude any options, including acquiring nuclear-powered submarines, as part of ongoing discussions to revise the nation's three security documents. A US Navy official highlighted that Japan already possesses nuclear power plants, which share technical commonality with submarine nuclear propulsion systems. The potential shift comes amid rising regional tensions and follows a proposal by the Japan Innovation Party in June calling for nuclear submarine introduction.
Key Points
- Defense Minister Koizumi Shinjiro confirmed on September 11 that discussions on revising Japan's three security documents will consider all options, including nuclear-powered submarines
- A US Navy official told Kyodo News that Japan already operates nuclear power plants, and the technology shares significant commonality with nuclear submarine propulsion systems
- The Japan Innovation Party, part of the ruling coalition with the Liberal Democratic Party, submitted proposals in June 2026 calling for the introduction of nuclear submarines
- Koizumi outlined advantages of nuclear submarines: extended submerged operations, speeds several times faster than conventional submarines, and enhanced crew safety
- However, nuclear propulsion systems come with extremely high costs and require specialized technical expertise for maintenance and operations
- Chief Cabinet Secretary Kihara Minoru separately proposed establishing a foreign intelligence agency modeled on the CIA or Britain's MI6, acknowledging Japan is "very weak" in this area
- Residents in Sasebo, Nagasaki Prefecture protested on September 7 against the JS Maya Aegis destroyer conducting Tomahawk cruise missile tests in the United States
Why It Matters
This development signals a potential major shift in Japan's defense posture, which has adhered to non-nuclear principles since World War II. The acquisition of nuclear-powered submarines would significantly enhance Japan's undersea capabilities amid intensifying security challenges in the Indo-Pacific region, potentially triggering regional reactions and raising questions about the long-standing prohibition on nuclear weapons possession.
This development signals a potential major shift in Japan's defense posture, which has adhered to non-nuclear principles since World War II. The acquisition of nuclear-powered submarines would significantly enhance Japan's undersea capabilities amid intensifying security challenges in the Indo-Pacific region, potentially triggering regional reactions and raising questions about the long-standing prohibition on nuclear weapons possession.