Xiangyanghong 22 Enters Japan's EEZ Near Diaoyu Islands for Suspected Taiwan Espionage

According to reports by Japanese media cited by Kyodo News on the 27th of this month, the Chinese naval research vessel Xiangyanghong 22 entered Japan's Exclusive Economic Zone (EEZ) near the Diaoyutai Islands five times between March and July of this year to conduct survey operations. The reports noted that such frequent maritime activities may be related to preliminary intelligence collection by China in preparation for a potential violation of Taiwan's territory, indicating that Beijing's actions in the East China Sea are no longer limited to routine scientific observation.

The Diaoyutai Islands (referred to by Japan as the Senkaku Islands) have been the focus of territorial disputes among China, Japan, and Taiwan since the last century. Taiwan claims sovereignty over the archipelago in accordance with the Territory Act of the Republic of China and lists them as the Diaoyutai Islands; Japan refers to them as the Senkaku Islands, asserting effective control since 1895 and delineating a 200-nautical-mile Exclusive Economic Zone under the United Nations Convention on the Law of the Sea; and mainland China calls them the Diaoyu Islands, claiming they have belonged to China since ancient times while intensifying maritime patrols and resource development in the East China Sea in recent years. This body of water not only abounds in fishery resources but also serves as a vital shipping corridor and potential oil and gas development area in East Asia, thereby holding high strategic value.

Under the United Nations Convention on the Law of the Sea, coastal states enjoy exclusive economic rights within a 200-nautical-mile range extending outward from their coastlines, and foreign vessels entering these areas without permission are theoretically in violation of the law. The Japanese government has repeatedly accused Chinese fishing and research vessels of intruding into its EEZ in the past, responding with expulsion, warnings, and diplomatic representations. Particularly since the 2010s, the frequency of Chinese vessel activities in the East China Sea has increased significantly, prompting the Japan Coast Guard to step up patrols and deploy radars and surveillance systems in certain waters to prevent such incidents from escalating into conflict.

As a research platform for the Chinese navy, the Xiangyanghong 22 is equipped with multifunctional equipment for ocean observation, seabed mapping, and data collection. Although official explanations often cite scientific research as the purpose of its voyages, from military and intelligence perspectives, similar vessels are frequently used to detect adversaries' maritime deployments and map seabed topography to support submarine route planning. Analysts point out that if Beijing intends to enforce a blockade or amphibious landing against Taiwan in the future, mastering the seabed topography and hydrological data of the East China Sea, especially around the Diaoyutai Islands, will be a critical prerequisite operation. Therefore, the vessel's multiple appearances within Japan's EEZ are viewed as intelligence and technical preparations by Beijing for a potential Taiwan Strait conflict.

For Taiwan, the implications behind such intelligence collection cannot be underestimated. Taipei has continued to strengthen its coastal defense construction in recent years, promoting the upgrading of maritime detection and air defense systems while relying on security guarantees from the United States and Japan. If China has been conducting systematic seabed mapping in the East China Sea, it would weaken Taiwan's tactical initiative in maritime operations and potentially affect the tactical arrangements of U.S.-Japan joint exercises. On the other hand, if Japan, as a primary U.S. ally in the Asia-Pacific region, continues to encounter "intrusions" by Chinese research vessels, it will heighten Tokyo's vigilance against Beijing and further drive U.S.-Japan defense cooperation in the East China Sea, forming a tighter security net for Taiwan.

In summary, the multiple entries of the Xiangyanghong 22 into the EEZ near the Diaoyutai Islands represent both concrete actions by China to demonstrate its maritime presence in the East China Sea and potential intelligence maneuvers to lay the groundwork for a future conflict in the Taiwan Strait. If the activities of such vessels do not abate in the future, it will compel Japan and the United States to step up maritime surveillance and diplomatic protests, while Taiwan will need to continuously enhance its coastal defense capabilities and strive for the attention and support of the international community. How all parties strike a balance between sovereignty disputes and regional security will become a major test for the political landscape of East Asia.