Boat from Philippines with gifts for fishers, troops and coastguard in South China Sea slipped past vessels that intercepted festive flotilla

It looked, for a time, as if Christmas had been cancelled. A Philippine mission by volunteers to bring the festive spirit to the fishers, troops and coastguard crew in the disputed South China Sea was forced to turn back on Sunday after organisers said they had been shadowed and intercepted by Chinese vessels.

But it later emerged that a smaller supply boat had managed to slip past the Chinese vessels.

Colonel Medel Aguilar says the Philippines will not stop resupply missions to a grounded warship that have developed into a potential flashpoint with Beijing

The Philippines has accused China of seeking to bully smaller countries into submission and vowed it will continue its missions to deliver supplies to a grounded derelict warship that serves as an outpost in the South China Sea.

The Philippines deliberately grounded BRP Sierra Madre at Second Thomas Shoal, a submerged reef in the Spratly Islands, in 1999 to guard against expansion by China, and the ship has become a growing flashpoint in the fiercely disputed water.

The Sierra Madre, deliberately marooned by the Philippines in 1999, is crumbling but repair is being made impossible by an effective blockade by Beijing

It is perhaps the most unlikely kind of military base. For more than two decades, a second world war-era ship, BRP Sierra Madre, has stood deliberately grounded in the remote, shallow waters of the fiercely contested South China Sea, carrying the Philippine flag and guarding against Chinese expansion.

But its future is increasingly precarious, and the ship has become a growing flashpoint in one of the world’s most disputed waters.