China said on Friday the Philippines had sent supplies to a beached warship on Second Thomas Shoal, a disputed atoll in the South China Sea.

The Philippines has protested China’s baselines around the disputed Scarborough Shoal, as tensions between the two nations build up anew over their competing claims in the South China Sea.

It is the second air-to-sea joint patrol as tensions have escalated around Scarborough, Second Thomas and Sabina shoals.