Supported by gunboats and a former U.S. Coast Guard cutter, Philippine Navy SEALs and Marines approached a South China Sea island owned by Manila in a simulated seizure drill as Chinese forces observed from afar on Wednesday.

Philippine forces practised retaking an island in the South China Sea Wednesday in the first such combat exercise in the disputed waters as Chinese navy ships kept watch from a distance, the Philippine military chief said.

China has yet to respond to the call, which includes payment for two damaged boats and the return of rifles seized during the June 17 stand-off The Philippine military chief has reiterated calls for Beijing to compensate for damages and return rifles seized during a violent confrontation in the disputed South China Sea that left a Filipino sailor with a severed thumb.

The Philippine military has opened two weeks of combat drills that will include seizing an island in the disputed South China Sea and likely be frowned upon by China.

In recent months, China has deployed navy, coast guard and so-called maritime militia forces – allegedly Chinese fishing vessels – in a bid to bar the Philippines from a trio of strategically important reefs and islands in the South China Sea.

China has rapidly expanded its military and has become increasingly assertive in pursuing territorial claims in the South China Sea, which Beijing claims virtually in its entirety.

China’s militarization of the South China Sea (SCS) has established a powerful anti-access/area-denial (A2/AD) network across the region, positioning it to delay or block U.S. intervention in a Taiwan contingency.