In this photo provided by the Philippine Coast Guard, a Chinese coast guard ship, top, tries to block a Philippine government vessel at the disputed South China Sea on Thursday March 21, 2024. Chinese coast guard ships, backed by a military helicopter, tried to dangerously block but failed to stop two Philippine government vessels carrying scientists from reaching two barren sandbars called Sandy Cay in the disputed South China Sea, Philippine officials said Friday. (Philippine Coast Guard via AP)