Japan announces submarine-launched hypersonic missile development from fiscal 2027

AI digestMimile.ai EditorialAugust 20, 2026 at 02:36 PM

This digest was compiled by AI from multiple sources — links to the originals are below.

Japan announces submarine-launched hypersonic missile development from fiscal 2027

Japan's Ministry of Defense announces plans to begin developing an underwater-launched hypersonic missile in fiscal 2027, according to Kyodo News and TASS reports published on August 19, 2026. The program is in the development stage and does not include disclosed range, propulsion, or submarine class. It follows a 2023 Mitsubishi Heavy Industries contract for a submarine-launched guided missile and a hypersonic missile research program running through fiscal 2031.

Key Facts

Japan's Ministry of Defense plans to begin developing an underwater-launched hypersonic missile in fiscal 2027, Kyodo News and TASS reported on August 19, 2026.
Kyodo described the weapon as underwater-launched, while TASS used the submarine-launched designation; neither disclosed range, propulsion, flight profile, warhead, launch mechanism, or intended submarine class.
The Ministry of Defense contracted Mitsubishi Heavy Industries in 2023 to develop a submarine-launched guided missile.
A separate official program launched in 2023 is researching a domestically developed hypersonic guided missile through fiscal 2031.

The Reported Program

On August 19, 2026, Kyodo News and TASS reported that Japan’s Ministry of Defense plans to begin developing an underwater-launched hypersonic missile in fiscal 2027. Kyodo described the planned weapon as underwater-launched, while TASS used the more specific submarine-launched designation. Neither report disclosed the missile’s range, propulsion system, flight profile, warhead, launch mechanism, or intended submarine class. The program remains at the development stage and is not an operational capability.

Existing Missile Programs

The Ministry of Defense contracted Mitsubishi Heavy Industries in 2023 to develop a submarine-launched guided missile. A separate official program launched in 2023 is researching a domestically developed hypersonic guided missile through fiscal 2031. The new program builds on Japan’s work on submarine-launched stand-off missiles, underwater vertical launch systems, and submarines configured to carry longer-range weapons. These programs form an emerging undersea strike architecture designed to improve survivability and complicate adversary air and missile defenses.

Counterstrike Context

The project is placed within Tokyo’s expanding counterstrike capabilities. The fiscal 2027 defense program includes the new underwater-launched hypersonic missile development. An official Japan Ministry of Defense rendering, edited by Army Recognition, shows a submarine equipped with a vertical launch system as Japan moves toward underwater-launched long-range and hypersonic strike capabilities.

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Japan announces submarine-launched hypersonic missile development from fiscal 2027

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Japan announces submarine-launched hypersonic missile development from fiscal 2027

Key Facts

The Reported Program

Existing Missile Programs

Counterstrike Context

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