Philippines, U.S. Test Air Defenses as China Seizes Reef

The 960th Air and Missile Defense Group of the Philippine Air Force (PAF) participated in a Subject Matter Expert Exchange (SMEE) with the US Marine Corps' 3rd Littoral Anti-Air Battalion and the US Army's 35th Air Defense Artillery at the Naval Education Training and Doctrine Command (NETDC) in San Antonio, Zambales on Friday, April 25, 2025. Image via the Armed Forces of the Philippines.

By Ted Aljibe

Missiles fired off the coast of the northern Philippines Sunday as U.S. and Filipino forces conducted their first integrated defense drills, hours after China said it had seized control of a reef claimed by Manila.

The Philippines and China have been engaged in months of confrontations over the South China Sea, which Beijing claims nearly in its entirety despite an international ruling that its assertion has no legal basis.

As many as 17,000 personnel are participating in the annual “Balikatan” exercises, which this year will simulate a “full-scale battle scenario” as the treaty allies seek to deter China’s ambitions in the disputed waterway.

Chinese state broadcaster CCTV on Saturday reported that the country’s coast guard had “implemented maritime control” over Tiexian Reef, also known as Sandy Cay, this month.

The tiny sandbank, part of the Spratly Islands, lies near Thitu Island, also called Pag-asa and site of a Philippine military facility.

The Philippine government has yet to formally respond to the claim.

In coastal Zambales province, hours north of the capital Manila, AFP journalists watched Sunday as the U.S. Marine Corp’s new MADIS short-range air defense system knocked a pair of drones from the sky.

The coastal defense exercise saw MADIS work in concert with the Philippines’ SPYDER missile system, defending it from drone attack as it targeted simulated incoming cruise missiles.

“MADIS is short-range. SPYDER is more of a medium-range capability (and they) both engaged different threats,” said Matthew Sladek, commander of the U.S. 3rd Littoral Anti-Air Battalion.

“The more we work together, that only … enhances our collective lethality.”

Blow to Regional Stability

Chinese warships have been spotted in waters near the Philippines since the Balikatan exercises kicked off last week.

The aircraft carrier Shandong on April 22 “was detected underway 2.23 nautical miles (about four kilometres) southwest” of the Philippines’ far northern Babuyan Island, the navy reported.

On Sunday, the Philippine Navy said three other vessels had been spotted a day before about 60 kilometres from Zambales.

U.S. defense secretary Pete Hegseth last month told an audience in Manila that the United States was “doubling down” on its alliance with the country, noting the necessity of deterrence “considering the threats from the Communist Chinese”.

Chinese foreign ministry spokesperson Guo Jiakun has since slammed the Balikatan exercises as a blow to regional stability.

On Monday, Balikatan will continue with troops simulating defending against an enemy landing force along a stretch of southern Palawan island.

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