In this May 14, 2019, photo, photo provided by the Philippine Coast Guard, U.S. Coast Guard Cutter Bertholf, right, and Philippine counterpart BRP Batangas conduct joint search and rescue and capability-building exercises off the South China Sea west of the Philippines. Captain John Driscoll, commanding officer of the U.S. Coast Guard National Security Cutter Bertholf (WMSL 750), told reporters Wednesday, May 15, 2019, two Chinese Coast Guard ships were spotted off the South China Sea while they were conducting the joint exercise with Philippine Coast Guard. (Philippine Coast Guard Via AP)