Marines Deploy Ship-Killing NMESIS Missiles Near Taiwan

The U.S. Marine Corps will deploy its NMESIS anti-ship missile system to Yonaguni Island, Japan’s westernmost territory and the closest Japanese land to Taiwan, during the Keen Sword 27 exercise running October 19 to 29, according to details drawn from Japan’s Ministry of Defense Okinawa Defense Bureau and reported by Army Recognition. It is the first time the system has operated from that specific island, which sits roughly 110 kilometers from Taiwan’s coast.

NMESIS — the Navy-Marine Expeditionary Ship Interdiction System — pairs a Naval Strike Missile with the unmanned ROGUE-Fires launcher, a JLTV-based carrier built by Oshkosh Defense. The missile travels at roughly Mach 0.9 in a low-altitude, sea-skimming profile intended to shorten an adversary’s reaction time, guided by inertial navigation and GPS en route with infrared terminal homing, per the same Army Recognition reporting. The Marine Air Defense Integrated System, a mobile short-range air defense unit built to counter drones, helicopters and low-flying aircraft, will deploy to Yonaguni alongside it, also for the first time.

Part of a wider exercise

The deployment is folded into Keen Sword 27, a recurring U.S.-Japan exercise that this year includes setting up a joint coordination center at the Japan Ground Self-Defense Force garrison on Yonaguni and testing transport routes through the island’s airport and fishing port. The drills are built around dispersed operations — moving small units and launchers between island locations to complicate targeting — a concept the Marine Corps has been refining across the First Island Chain since NMESIS first deployed to the Philippines during Exercise Balikatan and later trained from Japan’s Ishigaki island in 2025, as the South China Morning Post has reported. Yonaguni marks a further step west, placing a mobile strike capability within range of the waters on both sides of the Taiwan Strait’s southern approach.

Beijing’s response

China’s Ministry of National Defense objected to the move. Spokesperson Jiang Bin said “military cooperation between relevant countries should not target any third party, harm the interests of third parties, or undermine regional peace and stability,” and warned that “neo-militarism is increasingly showing signs of becoming a potential source of turmoil in East Asia,” according to Global Times, a state-run Chinese outlet that frequently carries Ministry of National Defense statements.

Chinese military affairs commentator Song Zhongping, cited in the same report, said the deployment signals a greater likelihood of Japanese and American involvement should a conflict break out over Taiwan, and suggested Beijing would need to adjust its own contingency planning and could respond with its own exercises. Song also argued that Yonaguni’s small size leaves any missile battery there vulnerable to detection and early strikes, limiting its practical military value even as it carries political weight.

Why Yonaguni matters

Yonaguni’s position gives it outsized significance despite its size — official population figures put it under 2,000 residents. The island already hosts a Ground Self-Defense Force garrison and a coastal radar station, built up over the past decade as Tokyo has shifted its defense posture toward the southwestern islands facing Taiwan. Stationing NMESIS there, even temporarily for an exercise, extends the reach of a weapon designed explicitly to hold ships at risk in contested straits, adding a land-based option to the carrier and submarine forces the U.S. and Japan already operate in the region.

The timing lands alongside a broader run of Chinese military activity near Taiwan that AmericaStrikes has tracked this week, including Taipei’s own National Day displays of military hardware, detailed in our coverage of Taiwan’s National Day flyover. It also follows a stretch of U.S. regional defense maneuvering across multiple theaters, from basing arrangements in the Gulf — see our report on Pentagon access to Qatar’s Al Udeid base — to stalled diplomacy over Ukraine, covered in our Kremlin-Rubio exchange on the Ukraine stalemate.

Neither the Pentagon nor U.S. Indo-Pacific Command has issued a separate public statement specific to the Yonaguni deployment beyond the exercise schedule published through Keen Sword 27’s joint planning documents. Japan’s government has not announced any change to Yonaguni’s permanent garrison as a result of the exercise; officials have described the NMESIS and MADIS units as rotational assets tied to the training period.

AmericaStrikes will continue following the exercise through its October 29 conclusion and any Chinese naval or air response in the surrounding waters.