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Philippines challenges Chinese vessel off northern province amid Taiwan tensions

The Philippine Coast Guard challenged the Chinese vessel for unapproved marine research within the exclusive economic zone, using Canada's satellite detection system to monitor activity.

  • On Tuesday, Dec 30, the Philippine Coast Guard dispatched an Islander aircraft to challenge the Chinese research vessel Er Hao after it was sighted about 19 nautical miles off northern Cagayan.
  • Using satellite data from Canada's Dark Vessel Detection program, authorities tracked the 87.25m vessel that left Hainan earlier this month and was monitored about 55.8 nautical miles east of Santa Ana.
  • Er Hao, an 87.25-meter deep-sea research vessel, functions as a mothership for submersibles, and the PCG Islander aircraft pilot issued multiple radio challenges during the MDA flight, which the vessel did not answer.
  • The PCG said it will keep monitoring and challenging unauthorized activity under President Ferdinand Marcos Jr., while the Chinese Embassy in Manila did not immediately respond amid China’s war games around Taiwan.
  • Philippine authorities note they have monitored China Coast Guard vessels `unlawfully operating` in the EEZ since early 2025, stressing that unconsented marine scientific research would breach Philippine and international law.
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The Straits Times broke the news in Singapore on Wednesday, December 31, 2025.
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