The China Coast Guard ship 2503, the Zhujiajian, has become a regular presence in the waters east of Taiwan. According to an analysis by Lu Wen-hao of the Chinese Society for Strategic Studies, published by The Storm Media on October 16, 2026, the ship shows that the coast guard is no longer just adding hulls. It is taking the engineering behind China’s best destroyers and using it to push law enforcement operations farther out to sea.
Ship 2503 is built on the hull of the navy’s Type 052D destroyer and displaces up to 6,500 tons at full load. The vertical launch cells and the phased-array radar have been removed. The 130 mm gun has been replaced by a 76 mm gun. The flight deck has been enlarged to about 40 meters, against about 26 meters on the coast guard’s Type 818 ships, which are derived from the Type 054A frigate. The destroyer’s gas turbine and diesel propulsion has been kept, so the ship can still make more than 30 knots. Lu argues that the larger deck matters most: it turns the ship into a combined air and sea enforcement platform and a command node for a patrol group operating far from shore.
The deployment pattern matters as much as the design. Since Beijing announced regular patrols east of Taiwan on June 1, the coast guard has rotated pairs of large ships through the area: 2502 with 2304 in June, 2305 with 1401 in July, 1306 with 2502 in September, and 2503 with 1401 by late September. Each rotation has included a larger share of high-performance ships. Lu sees this as part of a shift in the gray zone, with routine pressure moving from the navy to the coast guard, maritime agencies and research fleets. The waters east of Taiwan are deep and open directly onto the Western Pacific, which makes them a real-world test of long voyages, rough seas and helicopter operations.
Lu is careful not to overstate the case. The ship is not a warship in disguise, and the coast guard has not become a second navy. What has emerged is a layered fleet: converted corvettes and general enforcement ships near shore, frigate-derived ships for demanding missions, and destroyer-derived ships for the longest deployments. The shipbuilding base behind China’s surface combatants is now feeding directly into its maritime law enforcement force.
The takeaway for Taiwan and its partners is that counting hulls and tonnage no longer tells the story. The questions to track are hull lineage, aviation capability, patrol rotation, how ships are grouped, and how far they deploy. Lu adds that Taipei’s first task is to detect these ships early. This is gray-zone competition carried out with platforms built for endurance, presence and control of the area, not for combat.
Source: Lu Wen-hao, “China’s Coast Guard Is Borrowing Destroyer DNA To Patrol East Of Taiwan,” The Storm Media, October 16, 2026.