The Philippines said on Saturday it has suspended a scientific survey in the South China Sea after two of its fisheries vessels faced "harassment" and aggressive behavior from China's coast guard and navy.
Manila and Beijing have had a series of escalating confrontations in disputed waters of the South China Sea. China claims almost all the strategic waterway - through which $3 trillion in commerce moves annually - overlapping sovereignty claims by the Philippines, Indonesia, Malaysia and Vietnam.
Two Philippine fisheries vessels, on their way on Friday to collect sand samples from Sandy Cay near Philippine-occupied Thitu island, encountered "aggressive maneuvers" from three China Coast Guard ships, the Philippine Coast Guard said in a statement on Saturday.
In its own statement, China Coast Guard said China has "indisputable sovereignty" over the Spratly Islands, including Sandy Cay - which China calls Tiexian Reef - and that it had intercepted two Philippine vessels and driven them away in accordance with law.
China Coast Guard said the Philippine vessels had entered waters near Tiexian Reef without permission and attempted to "illegally" land on the reef to collect sand samples.
The Philippine embassy in Beijing and the Chinese embassy in Manila did not immediately respond to requests for comment.
China deployed four small boats from its larger coast guard vessels to "harass" two rigid hull inflatable boats deployed by the fisheries bureau to transport personnel to Sandy Cay, said the Philippine Coast Guard, which supported the scientific mission.
A Chinese navy helicopter also hovered at an "unsafe altitude" over the watercraft, it said.
Survey operations were suspended "as a result of this continuous harassment and the disregard for safety exhibited by the Chinese maritime forces," the Philippine Coast Guard said.
Manila and Beijing agreed during a round of talks on Jan. 16 to seek common ground and find ways to cooperate despite their disagreements over territorial claims in the South China Sea.
An international arbitration tribunal ruled in 2016 that China's claims, based on its historic maps, have no basis under international law, a decision Beijing does not recognize.
