New Cross-Strait Disturbance: Mainland Helicopters Cross Median Line, Lingering in Restricted Flight Zone
United Daily News Report, July 22, 2026
A People's Liberation Army (PLA) helicopter crossed the median line of the Taiwan Strait on Monday and remained for an extended period inside the R9 restricted flight zone of the Republic of China (Taiwan) Armed Forces east of the Taiwan Strait’s median line.
According to Chieh Chung, associate research fellow commissioned by the Institute for National Defense and Security Research (INDSR), this marks the first time a PLA helicopter has crossed the median line in the narrow section of the Taiwan Strait and remained east of the line for an extended duration. He warned that this could indicate the PLA may begin conducting irregular helicopter training for airborne assault operations against Taiwan within the Taiwan Strait, or even east of the median line. The Ministry of National Defense (MND) did not respond on July 21.
Separately, according to information released by a civilian social media page, the USNS Henson, a Pathfinder-class oceanographic survey ship operated by the U.S. Navy's Military Sealift Command, recently sailed northward through the Taiwan Strait. The vessel is equipped with sophisticated instruments, including multibeam sonar and echo sounders, to map the seafloor and monitor oceanographic data such as water temperature and salinity. The PLA's deployment of a helicopter to remain near the median line for an extended period may also have been intended to monitor the USNS Henson.
Chieh believes that the helicopter not only crossed the median line but also carried out what he described as a "restricted-zone transit flight" east of the line. It flew for an extended period within Taiwan’s R9 restricted flight zone while following a course roughly parallel to the median line.
According to Chieh, this is likely the first time since Beijing unilaterally abandoned the tacit understanding regarding the Taiwan Strait median line in August 2022 that a PLA helicopter has crossed the median line in the narrower central-to-northern section of the Strait. It also represents the first confirmed instance of a PLA helicopter conducting a "restricted-zone transit flight" east of the median line. In other words, the PLA has introduced two new patterns of gray-zone operations against Taiwan simultaneously.
He further explained that since Beijing abandoned the median-line understanding in August 2022, PLA helicopters have frequently appeared in the airspace surrounding Taiwan, many of them being shipborne helicopters. However, based on the information released by the Ministry of National Defense, it remains impossible to determine whether this helicopter was launched from a naval vessel or from a land-based PLA Army Aviation unit.
Chieh warned that if the helicopter originated from the PLA Army Aviation force, it raises concerns that the PLA may begin conducting irregular airborne assault training missions over the Taiwan Strait and even east of the median line.
He also noted that in recent years the PLA has increasingly conducted joint cross-sea assault exercises involving helicopters and unmanned aerial vehicles (UAVs). These drills primarily focus on integrated reconnaissance and strike operations, as well as the subsequent deployment of forces. However, such exercises have not previously been conducted directly across the Taiwan Strait. On Monday, in addition to the helicopter, a UAV also carried out a "restricted-zone transit flight" east of the median line, raising the possibility that the PLA may have conducted its first coordinated helicopter-UAV training operation within the R.O.C. military's restricted airspace east of the median line.
Lin Ying-yu, associate professor at the Graduate Institute of Strategic Studies, Tamkang University, speculated that, based on overlays of the PLA's military exercise maps from last year, the helicopter and UAV may have been conducting missions involving long-range rocket artillery impact observation and integrated reconnaissance-strike operations.
According to Wang Pei-lu, a former chief instructor at National Defense University, the PLA has rapidly expanded its helicopter capabilities in recent years with the objective of achieving "shore-to-shore" operations. During previous Han Kuang war games, the Armed Forces had simulated scenarios in which the PLA would first seize outlying islands such as Qimei and Wangan in the Penghu archipelago, establish forward helicopter bases there, and then launch airborne assaults toward northern or southern Taiwan.
However, Wang emphasized that before PLA helicopters could effectively participate in an invasion of Taiwan, they would first need to overcome their maximum flight-range limitations. Only if they can conduct round-trip attack or transport missions in "shore-to-shore" operations would helicopters become an effective operational platform.