Japan Accelerates Deployment of New Missiles to the Nansei Islands: Strengthening Deterrence Against China Indicated by Extended Range of Type 12 Anti-Ship Guided Missiles and Deployment of Hypersonic Glide Weapons

The Japanese Ministry of Defense has intensified the deployment of a new missile system to strategic locations centered around the Nansei Islands in March 2026. On March 9, the transport of the improved Type 12 surface-to-ship guided missile to the Kumamoto-Kengun garrison began, with the completion of troop deployment expected by March 31. On the same day, the initial deployment of the hypersonic glide projectile (HVGP) is also scheduled at the Fuji garrison in Shizuoka Prefecture, indicating that Japan's "stand-off defense capability" is entering a new phase.

The improved Type 12 surface-to-ship guided missile significantly extends the range of the conventional model that has been deployed since 2019, boasting a range of approximately 1,000 kilometers. This capability means it can cover the entire East China Sea, functioning as a deterrent against the activities of the Chinese Navy around the Senkaku Islands. Defense Minister Shinjiro Koizumi stated that this deployment aims to "early and remotely deter and eliminate invading enemy ships and landing forces." The stealth performance has also been enhanced, increasing survivability through improved detection avoidance capabilities.

The deployment of the hypersonic glide projectile (HVGP) represents a groundbreaking step in Japan's defense posture. This mobile ground-launched supersonic weapon flies on an irregular trajectory, making interception difficult and possessing the ability to penetrate China's missile defense systems. The Ministry of Defense has revealed plans to deploy the HVGP to the Fuji garrison and, in the future, to the Kamifurano garrison in Hokkaido and the Ebino garrison in southeastern Kyushu. Additionally, in June, the deployment of surface-to-ship missiles and live-fire training, as well as electronic warfare training, is planned for Minami-Torishima, an isolated atoll in the Pacific, indicating that Japan's defense range is expanding across the entire western Pacific.

These movements hold significant meaning in the context of the Japan-U.S. alliance. The Fuji garrison is a training facility jointly used by the Japan Ground Self-Defense Force and the U.S. Marine Corps, and Minister Koizumi emphasized that live-fire exercises and troop training at the East Fuji training area have "great significance in enhancing the deterrent and response capabilities of the Japan-U.S. alliance." Furthermore, on March 25, the U.S. State Department approved $340 million worth of equipment and services for the HVGP development program as foreign military sales (FMS). This occurred one week after Prime Minister Sanae Takaichi met with President Trump in Washington, symbolizing the deepening of Japan-U.S. defense cooperation.

The Japanese government is also advancing plans to develop a hypersonic version of the HVGP with U.S. support. This move is a strategic response to the current situation where China is leading in the development of hypersonic weapons. Since 2021, China has repeatedly conducted tests of hypersonic glide vehicles (HGVs), and the technology is rapidly maturing. Japan's choice to pursue joint development with the U.S. is believed to aim at securing technological superiority while enhancing Japan-U.S. interoperability.

During the Japan-U.S. expanded deterrence discussions held in February, the enhancement of China's "rapid, opaque, and destabilizing nuclear arsenal" and North Korea's advancing nuclear and missile programs were major topics. The discussions included participants from the Japan Joint Staff Office, the U.S. Joint Chiefs of Staff, the U.S. Indo-Pacific Command, and the U.S. Strategic Command, covering a wide range of security issues, including nuclear deterrence. Japan's acceleration of missile deployments is positioned as a concrete action to strengthen deterrent capabilities through conventional forces within this expanded deterrence framework.

However, Japan's strengthening of its defense posture is viewed with caution by neighboring countries. Chinese Foreign Ministry spokesperson Jiang warned on March 27 that the international community should be vigilant against Japan's "new militarism" and criticized the insufficient monitoring of the Self-Defense Forces' expansion. Prime Minister Takaichi's statement that "Japan is facing the most severe and complex security environment since World War II" was met with backlash, citing the military buildup of China and North Korea and the tightening cooperation among Russia, China, and North Korea.

Amid rising geopolitical tensions, Japan is steadily advancing towards acquiring substantial strike capabilities while maintaining its traditional framework of exclusively defensive defense. The extension of the Type 12 surface-to-ship guided missile's range provides capabilities close to enemy base attack capabilities, and the deployment of hypersonic glide projectiles serves as a means to counter China's A2/AD (anti-access/area denial) strategy. Furthermore, plans to acquire Tomahawk cruise missiles from the U.S. are also underway, with launches expected from upgraded Aegis destroyers.

This series of movements indicates a fundamental shift in Japan's defense strategy, moving from a focus on homeland defense to a forward-deployed defense posture that covers the entire "first island chain," including the Nansei Islands. As China strengthens its maritime expansion in the East China Sea and South China Sea, Japan aims to contribute to regional stability by qualitatively enhancing its defense capabilities while relying on its alliance with the U.S.

What remains to be seen is how the operational posture of these missile systems will be established. It is essential not only to deploy them but also to have effective command and control, information sharing, and rapid decision-making mechanisms in place. The increasing joint training between Japan and the U.S. is a practical effort towards enhancing interoperability and can be evaluated as improving the effectiveness of collaboration in times of crisis. The deployment to the geographically sensitive Nansei Islands requires strengthening vigilance and monitoring systems in peacetime while simultaneously building rapid response capabilities in times of emergency, which will likely become a new touchstone for Japan's defense policy.