Japan to Field Supersonic ASM-3ER for Dual Anti-Ship and Air-to-Air Roles

Key points

• The ASM-3ER is a supersonic anti-ship missile with a range of over 400 km, developed by Mitsubishi Heavy Industries and the Acquisition, Technology & Logistics Agency (ATLA).
• Japan’s FY2027 budget request includes mass production of the ASM-3ER, with operational service expected by FY2030.
• The missile will be adapted for an air-to-air role through software modifications, requiring no hardware changes, to target high-value airborne assets such as AWACS and tankers.
• The ASM-3ER features an integral rocket ramjet propulsion system, achieving speeds exceeding Mach 3, and includes satellite-based target updates for long-range engagements.
• The missile will be carried by the JASDF’s F-2 fighter aircraft, which will also field the improved Type 12 Surface-to-Ship Missile with a range of approximately 1,000 km.

Background

Japan’s defense strategy has increasingly focused on standoff strike capabilities to counter advanced Chinese naval air-defense systems. The ASM-3ER is an evolution of the earlier ASM-3, which was not fielded due to the need for greater range. The interim ASM-3A variant began deployment in FY2025. The new air-to-air role reflects a broader trend in defense doctrine, similar to Europe’s MBDA STRATUS RS missile, which uses supersonic ramjet technology for anti-high-value airborne asset missions.

How outlets are covering it

Naval News provides detailed technical and strategic insights into the ASM-3ER’s dual-role capability, emphasizing the software-based adaptation and the missile’s potential to target high-value airborne assets. The secondary source, Yahoo, appears to be a technical error page and does not provide relevant information on the story. Therefore, the primary source, Naval News, offers the most comprehensive and reliable perspective on Japan’s plans for the ASM-3ER.

Why it matters

The dual-role capability of the ASM-3ER enhances Japan’s ability to counter advanced air and naval threats, particularly from China. By leveraging a single missile for both anti-ship and air-to-air missions, Japan can optimize its defense budget and extend the operational reach of its F-2 fighters. This development underscores Japan’s strategic shift towards long-range, high-precision strike capabilities in response to evolving regional security challenges.

What to watch

Mass production and procurement of the ASM-3ER are scheduled to begin in FY2027, with operational service expected by FY2030. The JASDF will also begin fielding upgraded F-2 fighters capable of employing the improved Type 12 Surface-to-Ship Missile, further enhancing the aircraft’s anti-ship strike capabilities. Future developments may include further integration of the ASM-3ER with the JASDF’s command-and-control systems for enhanced target acquisition and engagement.