Lawmakers from Japan’s ruling coalition want nuclear-powered submarines mentioned in key security documents under review. Kyodo’s sources stressed that this would not mean Tokyo had decided to acquire them.
Japan may refer to nuclear-powered submarines in three key security documents slated for revision by the end of 2026. Kommersant, citing Kyodo, reported that lawmakers from the ruling coalition are pressing for the issue to be included, although it remains sensitive.
The idea has emerged within Prime Minister Sanae Takaichi’s administration as it reviews documents that underpin Japan’s defense and security policy. The country’s Self-Defense Forces do not currently operate nuclear-powered submarines.
Mentioning the option in the documents would not itself amount to a decision to buy such vessels. A government source cited by Kyodo said it could make more detailed discussions easier, whether or not Japan ultimately acquires them.
Japanese law restricts the use of nuclear energy, and previous administrations have said it cannot be used to power combat submarines for the Self-Defense Forces. Separately, Japan adheres to three non-nuclear principles: not possessing, producing or permitting the introduction of nuclear weapons. The report concerns nuclear propulsion, not a decision to arm submarines with nuclear warheads.