MANILA, Philippines — The Chinese research vessel suspected of conducting marine research off Itbayat, Batanes did not respond to the radio challenge of the Philippine Coast Guard’s (PCG) aircraft.

the U.S. Coast Guard said Monday. On Sunday, Coast Guard crews rescued four people from the ocean some 29 miles (25 nautical miles) off of St. Lucie Inlet, which is 46 miles (74 kilometers ...