Japan Ministry of Defense asked on 31 August to research an expansion module that would give an uncrewed underwater vehicle (UUV) a stand-off missile launch function, meaning a launch from beyond enemy air defences1. A second family of modules would give UUVs search, attack and underwater-network functions against underwater and surface targets. Both lines sit in the FY2027 budget request marked 事項要求, open-ended requests that carry no amount at all.
The request is the ministry's annual budget outline, the document that opens Japan's spending negotiation rather than settling it. The only firm figure near the uncrewed lines is 9.5 billion yen, and it belongs to a small general-purpose uncrewed ground vehicle (UGV), not to either undersea module2. A reader tempted to attach that number to the missile work is reading the wrong line of the same page.
Japan's own year-on-year framing shows the move. The FY2026 request grouped a small multipurpose UUV for intelligence collection inside a 128.7 billion yen SHIELD acquisition package. FY2027 breaks out missile-launch, attack and underwater-network module research as separate lines3. A supplier reading that designs to an interface rather than a hull, because the ministry names no vehicle, no builder and no delivery date, and a module written as a module can be sold to whichever hull wins later.
European navies have been buying the sensing end of the same problem. The Dutch defence ministry authorised an anti-submarine warfare uncrewed surface vessel design on 4 August and bought a Thales dipping sonar to put on it. Tokyo has asked for the weapon end instead, and left the price blank.
