The Philippine president said Thursday that his government would take action against what he called dangerous attacks by the Chinese coast guard and suspected militia ships in the disputed South China Sea, saying “Filipinos do not yield.”

Ferdinand Marcos Jr. did not provide details of the actions his government would take in the succeeding weeks but said these would be “proportionate, deliberate and reasonable in the face of the open, unabating, and illegal, coercive, aggressive and dangerous attacks by agents of the China coast guard and Chinese maritime militia.”

“We seek no conflict with any nation,” Marcos wrote on X, formerly Twitter, but said the Philippines would not be “cowed into silence.”

Marcos’s warning is the latest sign of the escalating disputes between China and the Philippines in the contested waters that have caused minor collisions between the coast guard and other vessels of the rival claimant nations, sparked a war of words and strained relations.