Keen Sword's Yonaguni line: US-Japan missiles 110 km from Taiwan

<p><em>Special Reporting from LSN News, adapted from today's Power Play Asia episode. <a href="https://youtu.be/7rTfpRaK5vg" target="_blank" rel="noopener">Watch the video on YouTube.</a></em></p>

<p>American and Japanese forces on Monday, 19 October, began their largest joint exercise yet, and its sharpest edge is on Yonaguni, Japan's westernmost island, about 110 kilometres from Taiwan. For the first time, the US Marine Corps is bringing a ship-killing missile system there. On Sunday, around Taiwan itself, 16 Chinese vessels were reported operating at once. Two moves, one strait.</p>

<h2>The Yonaguni line</h2>

<p>Keen Sword runs until 29 October. The Japan Times calls it the largest edition ever, with about 45,000 Self-Defense Force personnel and 12,000 American service members. Seven other countries are involved, five of them for the first time, among them France and Germany. Australia and the Philippines are on the list too.</p>

<p>The headline is Yonaguni. According to Japanese defence documents reported by USNI News, about 60 US Army and Marine personnel will deploy there with NMESIS, an unmanned launcher for the Naval Strike Missile, along with the MADIS air-defence system. NHK puts the missile's range at more than 180 kilometres. Japan is sending its own Type 88 anti-ship missiles to the island.</p>

<p>On Kyushu, Japan's new Type 25 missile leaves its base for the first time since entering service in March. Defense News puts its reach at 1,000 kilometres. None of these weapons will be fired. The point is the map. Analysts at the Institute for the Study of War and the American Enterprise Institute say Beijing likely fears such forces could bottle up its navy at the straits it uses to reach the Pacific.</p>

<h2>Beijing's answer: ships that never go home</h2>

<p>In the Global Times on Sunday, Chinese scholar Lü Chao called the Type 25 deployment, with its reach to China's coast, a clear provocation. In May, after earlier joint drills in the same islands, defence ministry spokesman Jiang Bin warned that “neo-militarism is increasingly showing signs of becoming a potential source of turmoil in East Asia.”</p>

<p>The real answer, though, is at sea. On Sunday, Taiwan's coast guard said 12 Chinese coast guard and research ships, plus four fishing boats, were active at once near Hualien, Pingtung, Kaohsiung and the Pratas Islands, Yonhap reports. Taipei called it fake law enforcement for real jurisdiction expansion. Last week, the aircraft carrier Liaoning drilled in the western Pacific, launching aircraft in Taiwan's eastern exclusive economic zone, according to the same think-tank analysts. Missiles that visit for eleven days are up against ships that never go home.</p>

<h2>The alliance's soft spots</h2>

<p>The first is politics. On 4 October, an Okinawa-based US Marine was arrested on suspicion of robbery and murder, in a case involving a Japanese woman. Japan's defence ministry has asked the US to keep troops' outings to the minimum, the Yomiuri reports. Local officials told Defense News the drill was scaled down because of opposition.</p>

<p>The second is ships. The Yokosuka-based carrier George Washington is in the Middle East. The USS Theodore Roosevelt docked at Yokosuka on Friday to take part, the first carrier not based in Japan to dock there in four years.</p>

<p>The third is Seoul. South Korea is not on the participant list. In Washington on Friday, Senator Dave McCormick urged the US, South Korea and Japan to fuse their technology and defence manufacturing. “If we do this right,” he said, “China will look across the Taiwan Strait every morning and conclude, ‘Not today.’”</p>

<h2>The scorecard</h2>

<p>On geography, Washington and Tokyo are ahead: Yonaguni puts allied missiles within reach of the waters east of Taiwan. On presence, Beijing leads: its ships work around Taiwan every day, not for eleven days every two years. On coalitions, the alliance is widening, with Europe, Australia and the Philippines involved, but the link to Seoul is missing. On home politics, Tokyo is under strain, with the Okinawa case and island towns pushing back.</p>

<h2>Our verdict</h2>

<p>Keen Sword wins the map, not yet the routine. Tokyo and Washington are turning the first island chain into a missile line, and Beijing must now plan around it. But a drill is a picture; gray-zone pressure is a habit. China does not need to match Keen Sword. It only needs to keep showing up after the troops go home.</p>

<p>Watch three things: whether Beijing stages drills of its own before 29 October, whether Yonaguni deployments become routine, and whether the Okinawa case erodes Japanese consent.</p>

<h2>Sources</h2>

<ul>

<li><a href="https://www.yomiuri.co.jp/national/20261019-GYT1T00218/" target="_blank" rel="noopener">Yomiuri Shimbun, 19 Oct 2026 12:51 JST</a></li>

<li><a href="https://www.japantimes.co.jp/news/2026/10/18/japan/keen-sword-military-exercises/" target="_blank" rel="noopener">The Japan Times (Jesse Johnson), 18 Oct 2026</a></li>

<li><a href="https://www.sankei.com/article/20261017-CHPEHVHSNJKUZC6QEPPA7TYZ6U/" target="_blank" rel="noopener">Sankei Shimbun, 17 Oct 2026</a></li>

<li><a href="https://news.usni.org/2026/10/06/u-s-japanese-forces-to-rehearse-defense-of-japans-southwest-islands" target="_blank" rel="noopener">USNI News (Dzirhan Mahadzir), 6 Oct 2026</a></li>

<li><a href="https://www.stripes.com/branches/marine_corps/2026-10-06/madis-nmesis-type-88-keen-sword-japan-23078373.html" target="_blank" rel="noopener">Stars and Stripes (McElhiney, Koja), 7 Oct 2026</a></li>

<li><a href="https://www.defensenews.com/global/asia-pacific/2026/10/05/us-marine-corps-anti-ship-weaponry-to-see-exercise-action-on-remote-japan-island-near-taiwan/" target="_blank" rel="noopener">Defense News (Leilani Chavez), 5 Oct 2026</a></li>

<li><a href="https://www.globaltimes.cn/page/202610/1371655.shtml" target="_blank" rel="noopener">Global Times (Zhao Yusha), 2 Oct 2026</a></li>

<li><a href="https://www.chinadaily.com.cn/a/202605/28/WS6a184e4ba310d6866eb4b477.html" target="_blank" rel="noopener">Jiang Bin May remarks also China Daily, 28 May 2026</a></li>

<li><a href="https://www.globaltimes.cn/page/202610/1372465.shtml" target="_blank" rel="noopener">Global Times (Feng Fan), 18 Oct 2026</a></li>

<li><a href="https://www.yna.co.kr/view/AKR20261019054100083" target="_blank" rel="noopener">Yonhap (Han Jong-gu, Beijing), 19 Oct 2026</a></li>

<li><a href="https://www.aei.org/commentary/china-taiwan-update-october-16-2026/" target="_blank" rel="noopener">ISW-AEI China &amp; Taiwan Update, 16 Oct 2026</a></li>

<li><a href="https://news.usni.org/2026/10/16/carrier-uss-theodore-roosevelt-arrives-in-japan-ahead-of-keen-sword-exercise" target="_blank" rel="noopener">USNI News, 16 Oct 2026</a></li>

<li><a href="https://biz.chosun.com/en/en-international/2026/10/19/R3JGRZWKSBEIRJD6XEODJROHUA/" target="_blank" rel="noopener">Chosun Biz, 19 Oct 2026</a></li>

</ul>