Japan trades its shield for a sword sharpened for China

In the early hours of a quiet morning in March 2026, a tightly guarded military convoy moved through Kumamoto Prefecture in southern Japan. Its destination was Camp Kengun, a base operated by the Japan Ground Self-Defense Force. The vehicles carried launch units of the upgraded Type-12 Surface-to-Ship Missile, deployed under strict secrecy.

The operation symbolized a turning point in Japan’s postwar security policy. For the first time since the end of World War II, Tokyo is fielding strike capabilities capable of reaching targets far beyond its own territory. The shift reflects the emergence of what Japanese strategists increasingly describe as “active deterrence,” a doctrine that will reshape the strategic balance across the Indo-Pacific.

The timing was hardly coincidental. Tensions in the Taiwan Strait remain volatile, while disputes in the East China Sea continue to intensify. For decades, Japan maintained a defensive posture focused primarily on protecting its own islands.

That paradigm began to change after Tokyo revised its 2022 National Security Strategy. The document formally introduced the concept of counterstrike capability, allowing Japan to strike enemy military bases beyond its borders if an attack is imminent or already underway.

This shift fundamentally alters the traditional structure of the US-Japan alliance. Historically, Japan acted as the defensive shield while the United States provided the offensive spear. The extended-range Type-12 missile now blurs that division. With a reach approaching 1,000 kilometers, Japan is gradually developing the ability to project military power independently.

From Japan’s southwestern island chain, the missile’s operational radius extends toward key coastal regions of China and strategic facilities in North Korea. This capability marks a significant departure from Japan’s strictly defensive posture, giving Tokyo new leverage in regional deterrence calculations.

Doctrinal shift

The Type-12 missile is developed by Mitsubishi Heavy Industries, long regarded as the backbone of Japan’s defense manufacturing sector. Yet the upgraded version represents far more than a technical refinement.

The original missile, introduced in 2015, was designed mainly for coastal defense and had a range of about 200 kilometers. The extended-range variant, often referred to as Type-12 SSM-ER, has been substantially redesigned. Engineers replaced the earlier turbojet propulsion system with a more efficient turbofan engine, enabling significantly greater range while improving fuel efficiency.

Stealth characteristics were also integrated into the missile’s airframe. Angular surfaces reduce radar visibility, allowing the missile to fly low over the sea while avoiding detection by enemy air-defense systems. These features make interception far more difficult during the missile’s approach phase.

The program reflects Japan’s rapidly expanding defense budget. Tokyo has allocated roughly 177 billion yen, around US$1.13 billion, for the upgraded system’s procurement. This investment forms part of a broader military expansion that pushed Japan’s defense spending to nearly 9 trillion yen in fiscal year 2026, the highest in its modern history.

The missile is also evolving into a multi-platform system. Future variants designed for naval vessels and aircraft, including the domestically built Mitsubishi F-2 fighter aircraft, are expected to enter service around 2027.

At the same time, Japan is strengthening its intelligence, surveillance and reconnaissance capabilities through new satellite networks that can deliver real-time targeting data. Despite these developments, cooperation with the US remains central. Intelligence sharing and integrated targeting continue to anchor the alliance’s broader deterrence framework.

Operational exercises have already demonstrated the missile’s potential. During the multinational military drill Talisman Sabre 2025 in Australia, the upgraded Type-12 displayed complex terminal maneuvers designed to evade advanced naval defenses.

Such capabilities make it a formidable tool for sea-denial operations along the First Island Chain stretching from Kyushu to the Ryukyu Islands.

Regional “missile wall”

Japan’s new missile capability carries implications far beyond its own territory.

Tokyo has recently revised longstanding restrictions on defense exports, opening the possibility of transferring advanced military systems to trusted partners. If implemented widely, the Type-12 could become part of a distributed network of coastal missile defenses across the Indo-Pacific.

Australia has explored the system as a potential complement or alternative to American missile programs. With its long range and estimated cost of roughly $3 million per missile, the Japanese system is considered well-suited to defending vast maritime approaches.

There is reported interest in the system in Southeast Asia. Both the Philippines and Vietnam, countries directly involved in maritime disputes in the South China Sea, have signaled interest through Japan’s Official Security Assistance framework.

For Manila, such systems could significantly strengthen defenses around the Luzon Strait, a crucial maritime corridor linking the Pacific Ocean and the South China Sea. Coastal missile deployments there would complicate any Chinese attempt to project naval power through the area.

If adopted by several countries simultaneously, these systems could form what analysts describe as a “regional missile wall.” In practice, such a network would allow participating states to share surveillance data and coordinate targeting, raising the strategic costs of any maritime aggression.

For countries such as Indonesia, Japan’s expanding military role presents both opportunities and dilemmas. A stronger Japanese security presence could help maintain balance in an increasingly competitive region. Yet it may also accelerate a regional arms race as states seek to expand their own long-range strike capabilities.

Seething dragon

China has reacted sharply to Japan’s expansion of its missile capabilities. Officials in China argue that Tokyo’s growing strike capability revives elements of militarism once thought buried after World War II.

Beijing has responded with both political criticism and economic pressure. In early 2026, China tightened export controls on several dual-use materials essential to advanced defense manufacturing. The restrictions require special licenses for items that could support military production abroad, a move widely interpreted as an attempt to slow Japan’s missile development.

China may also seek to discourage Southeast Asian countries from purchasing Japanese systems, portraying such deals as destabilizing to regional security. At the same time, military signaling has intensified.

Chinese naval activity has increased near Iwo Jima and the Nansei Islands, underscoring the strategic importance of these waters in the Western Pacific. By contrast, the US has welcomed Japan’s expanding capabilities. Within Washington’s broader strategy of integrated deterrence, a stronger Japan is seen as key to maintaining regional balance vis-à-vis China.

Ultimately, the deployment of the upgraded Type-12 missile reflects a shift in Asia’s geopolitical landscape. Japan is no longer content to remain a passive actor amid intensifying strategic competition.

By developing long-range missile technology and expanding security partnerships, Tokyo is gradually weaving a broader network of deterrence across the Indo-Pacific, one that could reshape the region’s balance of power for decades to come.

Ronny P Sasmita is senior international affairs analyst at Indonesia Strategic and Economic Action Institution, a Jakarta-based think tank.