JavaScript Required

Jumpseat Aerospace News requires JavaScript to function. Please enable JavaScript in your browser settings to continue.

Japan Weighs Nuclear Submarines Amid Rising Threats

September 15, 2026

1 min read

Key Takeaways

Japan considers acquiring nuclear-powered submarines.
Defense Minister Shinjiro Koizumi keeps the option on the table.
Nuclear submarines offer greater speed and endurance but at higher costs.
Japan plans to include submarine-launched hypersonic weapons in its budget.

Silver membership required Upgrade to Silver to access Key Takeaways.

Upgrade

Strategic Implications

Japan's consideration of nuclear-powered submarines may signal a shift in its defense strategy, potentially strengthening its undersea deterrent against China's rising naval threat. This move could indicate a willingness to reconsider nuclear taboos, which may have significant implications for regional security dynamics.

Silver membership required Upgrade to Silver to access Strategic Implications.

Upgrade

What Happened

Tokyo Explores Nuclear Propulsion To Counter China's Naval Expansion

Japan is weighing the option of acquiring nuclear-powered submarines to enhance its undersea deterrent capabilities, amid rising threats from China and North Korea. Defense Minister Shinjiro Koizumi has confirmed that the option is being considered, with the US Navy also suggesting discussions should proceed. The move would mark a significant shift in Japan’s defense strategy, with potential implications for regional security dynamics. This development was first reported by Asia Times.

Source | Originally Published: September 14, 2026

Companies Mentioned