Japan to possibly reference nuclear-powered submarines in security policy revisions

Japan is expected to insert a clause on nuclear-powered submarines into its three principal defence and security documents before the end of the year, according to insiders. The wording would merely note that the issue will be considered, allowing more concrete discussion without implying a decision to acquire such vessels. The proposal has gained traction among certain members of the ruling coalition and the Japan Innovation Party, who argue that nuclear-propelled subs could strengthen deterrence amid China’s growing assertiveness.

Prime Minister Sanae Takaichi’s cabinet is steering the revision process, even as Japan’s law restricts nuclear energy to peaceful uses and upholds three non-nuclear principles. An expert panel reviewing the drafts includes advocates for the submarines, highlighting the tension between legal constraints and strategic concerns.