Japan may add mention of nuclear subs to key security documents

Japanese authorities may incorporate references to nuclear-powered submarines in crucial security documents by the end of the year, potentially sparking further discussion and research, according to sources familiar with the matter. The proposal has been raised by certain lawmakers within the ruling coalition who advocate for the possibility of acquiring such vessels, although the matter remains sensitive.

Any mention of these submarines in the key documents is expected to avoid implying a firm decision to purchase them. The notion has come forward within Prime Minister Sanae Takaichi's administration as work proceeds to revise the three primary documents guiding Japan's defense and security policies.

Government officials state that mentioning the subject of nuclear-powered submarines in the documents could facilitate more concrete discussions, regardless of whether the country decides to acquire these vessels. Japanese law prohibits the use of nuclear power for anything other than peaceful purposes, and previous administrations have emphasized that it cannot be utilized to power submarines operated by the Self-Defense Forces.

Japan currently adheres to three non-nuclear principles, which forbid the possession, production, or introduction of nuclear weapons on its territory.

Some members on the government's expert panel examining the documents are advocating for the introduction of nuclear-propelled submarines due to the growing assertiveness of China, which is also a nuclear power. The Japan Innovation Party, the junior coalition partner of Takaichi's Liberal Democratic Party, also supports the idea of Japan acquiring such vessels.