Features

After a 2025 fraught with deadly clashes on their land border, Thailand and Cambodia have turned to a seldom-used article of international law to resolve their overlapping maritime claims. On September 15, the foreign ministers of Thailand and Cambodia delivered opening statements in Singapore before a conciliation commission constituted under the United Nations Convention on […]

In response to a May announcement that Japan and the Philippines would launch maritime boundary delimitation talks, China has deployed survey and law enforcement ships to conduct a series of unprecedented operations in the Philippine Sea. The scale and character of China’s response suggest that these operations are not just about sending a signal to […]

Eight months after China began dredging at Antelope Reef in the Paracel Islands, the first signs of major infrastructure at the new artificial island have emerged. Satellite images from August show digging that appears likely to be the start of a new runway: No concrete or other paving material has been laid down yet and work has only […]

Midway through 2026, Scarborough Shoal remains the focal point of Philippine-China frictions in the South China Sea, with recent tensions stemming from China’s deployment of floating objects at the shoal, including buoys, floating barriers, and most recently, a temporary research structure. But new data on ship movements reveals yet another cause for concern at Scarborough: […]

China has constructed three new oil and gas platforms in the East China Sea over the past year, drawing formal protests from Japan. But tracking data of Chinese mobile drilling rigs and survey ships shows that Beijing may be planning to expand the geographic footprint of its operations into waters even more sensitive for Tokyo, […]

Vietnam continues to expand the size and scope of its Spratly Island outposts, maintaining the pace of island building seen over the past several years while also beginning to construct specialized infrastructure at features where land reclamation is already complete. Since AMTI’s last measurement in March 2025, Hanoi has proceeded with its dredging and landfilling […]

Pratas Island lies at the northern edge of the South China Sea under the administration of Taiwan. Although it has not drawn the same attention as potential flashpoints like the Kinmen and Matsu Islands in the Taiwan Strait, recent analysis has highlighted Beijing’s deployment of oil and gas rigs in waters near Pratas. Less examined, […]

Media reporting in early 2026 has highlighted new Chinese dredging and landfill activity at Antelope Reef in the Paracel Islands. This is the first significant artificial island-building Beijing has undertaken in the South China Sea since 2017.  But the more consequential—and underreported—development may be the projected size of the artificial island. If construction proceeds at […]

Satellite imagery analysis indicates that China’s maritime militia—consisting both of professional militia and the civilian members of the “Spratly Backbone Fishing Fleet”—deployed in record-high numbers across the South China Sea in 2025, building on the elevated activity documented in 2024. While militia deployed to all the reefs AMTI has documented since 2021, the data shows […]

By Jennifer Jun, Asia Maritime Transparency Initiative, and Victor Cha View of the Atlantic Amsterdam, the Chinese “central integrated management platform” located in the PMZ in October 2022, relocated to Weihai Shipyard in January 2026. Copyright © 2026 by Planet. Image may not be republished without permission. Please contact imagery@csis.org. Key Findings CSIS analysis confirms […]

After years of consistency in patrolling all corners of Beijing’s nine-dash line claim, the China Coast Guard (CCG) made a major shift in 2025 to focus its efforts on Scarborough Shoal and Sabina Shoal. Analysis of AIS data from commercial provider Starboard Maritime Intelligence indicates that while China’s overall patrol volume has increased compared to […]

By Jennifer Jun, Asia Maritime Transparency Initiative, and Victor Cha View of the Atlantic Amsterdam, the Chinese “central integrated management platform” for its aquaculture cages, in the Provisional Measures Zone (PMZ), a few hours before it was moved out of the zone. Copyright © 2026 by Planet. Image may not be republished without permission. Please […]

By Jennifer Jun, Asia Maritime Transparency Initiative, and Victor Cha Sources: CSIS Beyond Parallel; Republic of Korea Navy Headquarters Report submitted to the South Korean National Assembly, shared with the press Key Findings This report focuses on China’s marine observation buoys in and adjacent to the Provisional Measures Zone (PMZ) in the waters between China […]

China’s artificial island bases have been out of the spotlight in recent years, with most coverage of the South China Sea instead focused on the activities of China’s coastguard, navy, and militia—or on Vietnam’s eye-catching efforts to expand its own outposts. But in the years since AMTI last looked at Chinese island upgrades in 2022, […]

The Philippine Coast Guard on October 15 released photos of two newly installed Chinese buoys at Scarborough Shoal. Coming in the wake of security concerns from South Korea over similar Chinese floating structures in the Yellow Sea, the buoys’ installation has raised alarms in Manila over the possibility that Beijing’s increasing efforts to assert control […]

By Jennifer Jun, Asia Maritime Transparency Initiative, and Victor Cha Left: Image of the Shen Lan 1, the first of the two aquaculture cages to be deployed inside the South Korea-China Provisional Measures Zone (PMZ), tethered to a support vessel. Right: View of the Shen Lan 2, May 30, 2025. Copyright © 2025 Vantor. Image […]

On September 10, China announced the establishment of a nature reserve at Scarborough Shoal. The area in question, however, conspicuously overlaps with an area that has sustained major damage from Chinese clam harvesting. The Nature Reserve The reserve covers an area of about 8,700 acres along the northeastern side of Scarborough. It consists of two […]

Since the start of 2025, Vietnam has expanded its island-building efforts to eight features previously untouched by the current round of reclamation that Hanoi began in 2021. New Dredging Recent satellite imagery shows that Vietnam has undertaken dredging and landfill work at Alison Reef, Collins Reef, East Reef, Landsdowne Reef, and Petley Reef, all of […]

China constructed two new oil and gas platforms in the East China Sea in May and June, drawing formal protests from Japan. But in addition to these new permanent structures, satellite imagery and automatic identification system (AIS) data shows that at least three mobile drilling rigs have also been active in the area, supporting both […]

In late February 2025, South Korean research vessel Onnuri made its way to the Provisional Measures Zone (PMZ) shared between South Korea and China. The vessel was deployed to survey one of three Chinese steel structures that were installed in the PMZ without prior notice to South Korea. The vessel’s journey was unsuccessful, as the Chinese coast […]

In the wake of an agreement last July to reduce tensions at Second Thomas Shoal, Scarborough Shoal has reemerged as the focal point of tensions between Manila and Beijing in the South China Sea. China has maintained a permanent coast guard presence at Scarborough since it seized control of the feature from the Philippines in […]

As part of efforts to achieve independence from Chinese supplies of critical minerals, the Trump administration has expressed renewed U.S. interest in deep sea mining. An April 24 executive order titled Unleashing America’s Offshore Critical Minerals and Resources aims to rapidly develop U.S. seabed mining capabilities, including expediting the process for issuing mining licenses in […]

After the official opening of Cambodian-Chinese joint facilities at Ream Naval Base in early April, the base quickly hosted visits from both Japan and Vietnam. But closer examination of those visits, as well as the physical layout of infrastructure at Ream, suggests that China maintains exclusive access to some facilities, including the base’s largest pier. […]

Vietnam has considerably expanded its Spratly Island outposts over the last ten months, completing a record year of island building in 2024 and moving on to dredge in new areas even as some features approach completion. Since AMTI’s last update in June 2024, Vietnam has created 641 new acres of land, continuing at the breakneck […]

Satellite imagery analysis shows that China’s maritime militia deployed to the South China Sea in record numbers in 2024.  But in contrast to recent years, a majority of ships spent most of their days anchored at China’s military outposts rather than at unoccupied reefs where they might pretend to fish. This suggests Chinese authorities are […]

Despite a turbulent 2024 in the South China Sea, at least one constant remained: the China Coast Guard’s (CCG) presence was ubiquitous but seemingly unable to impose Beijing’s will on other claimants. Analysis of AIS data from commercial provider Starboard Maritime Analytics shows that Beijing maintained daily patrols at key locations across the South China […]

Global public awareness of China’s maritime militia has grown dramatically over the past several years. Once a shadowy group who, outside of China, was known only to experts in Chinese maritime and fisheries policy, videos of militia vessels actively supporting the China Coast Guard (CCG) in confrontations with the Philippines have now become a familiar […]

This February, Beijing vowed to increase China Coast Guard (CCG) patrols around the Taiwan-administered Kinmen islands following an incident between Taiwan’s Coast Guard Administration (CGA) and a Chinese motorboat. The CGA has since reported numerous cases in which CCG vessels entered the restricted and prohibited waters around Kinmen and Matsu. But both Taiwan and the […]

Vietnam now has two airstrips in the Spratly Islands—but it may not be long until it gets another. As reported October 25 by Radio Free Asia, Vietnam has begun laying down a runway on Barque Canada Reef. The area currently being prepared for paving is approximately 8,000 feet long—twice the length of Vietnam’s existing runway […]

The China Coast Guard (CCG) is in its 12th day facing off against Indonesian law enforcement and naval vessels over oil and gas resources in the northern portion of the latter’s continental shelf in the South China Sea. While the Indonesian Maritime Security Agency (Bakamla) has reported multiple times that it succeeded in expelling the […]