U.S. President Joe Biden on Sunday met virtually with his counterparts from Japan and the Philippines to advance cooperation among the three countries, the White House said.

Chinese coast guard ships and a navy helicopter harassed a group of Philippine fisheries vessels conducting a scientific survey in a hotly disputed area of the South China Sea, Philippine officials said.The move forced the fisheries to cancel the operation, the Philippine coast guard said on Saturday.The Chinese coast guard and navy’s harassment of the Philippine vessels took place on Friday near Sandy Cay, three small uninhabited sandbars planked by an artificial island base of Chinese forces and a Philippines-occupied island in the Spratlys archipelago, the coast guard said.The coast guard ships approached two larger vessels, which manoeuvred to avoid a collision, and a Chinese navy helicopter flew low over two smaller boats deployed by the ships, forcing the survey to be called off.Videos released by the Philippine coast guard show a Chinese coast guard ship sailing very close to a ship officials identified as one of the Philippine vessels.Another video shows a Chinese military helicopter hovering low over the rough seas near a vessel flying a Philippine flag.There was no immediate response from Chinese officials, but China has repeatedly asserted sovereignty over most of the South China Sea and accused rival claimant states, including the Philippines, Vietnam and Malaysia of encroachment.China has demarcated its territorial claims with a 10 dashed line printed on maps but has not provided the exact coordinates.The latest flare-out of the long-simmering territorial disputes in one of the world’s busiest trade and security passageways could test President Donald Trump’s commitment to maintain America’s role as a counterweight to China, which has increasingly carried out assertive actions in the disputed waters.His predecessor, Joe Biden, strengthened an arc of security alliances in Asia while in office in a bid to curb China’s aggressive actions in the South China Sea, East China Sea and around Taiwan, a self-governed island which Beijing has vowed to take by force if necessary.Secretary of state Marco Rubio in a telephone call on Wednesday with his Philippine counterpart, Enrique Manalo, discussed issues of mutual concern, including “the People’s Republic of China’s dangerous and destabilizing actions in the South China Sea,” State Department spokesperson Tammy Bruce said.Mr Rubio “conveyed that the PRC’s behaviour undermines regional peace and stability and is inconsistent with international law,” Ms Bruce said in a readout of the call.Mr Rubio “underscored the United States’ ironclad commitments to the Philippines under our Mutual Defense Treaty,” Ms Bruce said.Mr Biden and his administration had repeatedly warned China that the US is obligated to help defend the Philippines, its oldest treaty ally in Asia, if Filipino forces, ships and aircraft come under armed attack including in the South China Sea.China has warned the US to stay away from what it says is a purely Asian dispute.