MANILA, Philippines —China has strongly opposed the Philippines’ decision to rename more than 100 maritime features in the Kalayaan Island Group, warning that it will take “necessary measures” to defend its territorial claims in the South China Sea. The move by Manila has reignited tensions between the two countries over sovereignty in the disputed waters.

Beijing expressed sharp disapproval after President Ferdinand Marcos Jr. signed an executive order renaming reefs, shoals, and other features in the Kalayaan Island Group, which lies within the West Philippine Sea. The Philippines said the renaming was part of efforts to standardize local names and assert sovereignty over the area.

Chinese Foreign Ministry spokesperson Mao Ning declared that China “firmly opposes” the action, accusing the Philippines of “illegally delineating” the Kalayaan Island Group and assigning names to features that China considers part of its claimed “Nansha Qundao.” She added, “China will do what is necessary to firmly defend its territorial sovereignty and maritime rights and interests.”

The Philippines, however, maintains that the features are within its exclusive economic zone and sovereign territory, citing the 2016 arbitral tribunal ruling that invalidated China’s sweeping claims in the South China Sea. Philippine officials emphasized that the renaming initiative is a domestic matter aimed at strengthening national identity and maritime governance.

China’s warning comes amid heightened maritime tensions, with recent reports of confrontations between Philippine vessels and Chinese coast guard ships in the West Philippine Sea. Analysts say the renaming could further strain relations, as Beijing views such actions as direct challenges to its sovereignty claims.

The Department of Foreign Affairs has defended the move, stressing that the Philippines is acting within its rights under international law. Officials also noted that the renaming is part of broader efforts to raise awareness among Filipinos about the country’s maritime domain.

Regional observers warn that the dispute could escalate if China follows through on its threat to take “measures” against the Philippines. The issue underscores the ongoing struggle for control in the South China Sea, a vital waterway for global trade and regional security.

As of now, the renamed features remain officially recognized by the Philippine government, while China continues to reject the initiative. The situation highlights the deepening divide between Manila and Beijing over sovereignty in the contested waters.