PCG Launches Formal Investigation into Pag-asa Territorial Incursion, Dismisses China's 'Stunt' Characterization and Pledges 'Close Watch'

The Philippine Coast Guard (PCG) formally announced an investigation on May 18, 2026 into the incursion by personnel from the Chinese research vessel Xiang Yang Hong 33 onto Sandy Cay 2 and Sandy Cay 3 within the territorial waters of Pag-asa (Thitu) Island. PCG Commandant Admiral Ronnie Gil Gavan and PCG spokesperson directly rejected China's characterization of the Philippine Coast Guard aircraft's challenge operations as a 'stunt' — China's Global Times had described the PCG aircraft's repeated radio challenges as 'harassment' at 'Houteng Jiao.' The PCG reaffirmed its legal authority under UNCLOS and Philippine domestic law to issue challenges and demand cessation of unauthorized activities within Philippine territorial waters. PCG pledged to maintain a 'close watch' on Chinese research vessel and CCG activities in the Pag-asa Island vicinity. The PCG stated it had documentation of the Chinese landing from the PCG Islander 4177 aerial surveillance mission conducted on May 17. The May 18 investigation announcement and 'stunt' dismissal represent the PCG's formal institutional response to what it characterized as an illegal territorial incursion by Chinese personnel — a separate and more serious category than the EEZ violations at Reed Bank (UNCLOS Article 246 marine scientific research without Philippine consent) that characterized the standoff's earlier phase. Philippine national security analysts and legal experts noted that the Pag-asa territorial sea incursion provides new grounds for a diplomatic protest, in addition to the May 11 note verbale on Scarborough's 'marine nature reserve' and the Reed Bank UNCLOS Article 246 protest that China had left unanswered for seven days. Former Justice Antonio Carpio warned that any permanent Chinese infrastructure installation on the Pag-asa sandbars would represent a major and potentially irreversible escalation of the West Philippine Sea crisis.