Beijing's water cannon and drone drills near disputed South China Sea shoals signal escalating geopolitical tension.
Context
What happened: China's coastguard conducted an exercise with water cannons and drones near Second Thomas Shoal and Sabina Shoal, according to state broadcaster CCTV, which did not specify dates.
Why it matters: The drills are described as preparation for "foreign infringement" near reefs at the centre of China's contention with the Philippines.