Key facts
- Prime Minister Sanae Takaichi is considering nuclear-powered submarines for Japan's Maritime Self-Defense Force.
- The proposal is dividing Japan's ruling coalition.
- Japan is set to revise its core security documents by year's end.
- Defense Minister Shinjiro Koizumi stated that no options are being ruled out.
- Legal restrictions, technological challenges, high costs, and crew requirements present obstacles.
Japanese Prime Minister Sanae Takaichi is considering the acquisition of nuclear-powered submarines for the Maritime Self-Defense Force, a move that has long been considered taboo in the country. The proposal comes amid rising tensions with China and a broader review of Japan's national defense strategy. Takaichi stated on October 14 that the possibility would be seriously considered in a concrete and realistic manner. The proposal is dividing the ruling coalition as Tokyo prepares to revise its key security documents by the end of 2026. Defense Minister Shinjiro Koizumi previously indicated that no options were being ruled out in strengthening deterrence, though significant obstacles remain, including legal restrictions, technological challenges, high costs, and crew requirements.