What is the recent incident causing tensions between China and the Philippines in the South China Sea?

The Philippine Coast Guard has accused the Chinese Navy of performing dangerous flight maneuvers when a Chinese military helicopter flew dangerously close (approximately 3 meters) to a Philippine government aircraft. The Philippine plane was conducting maritime domain awareness over Scarborough Shoal, a prime fishing area located within the Philippines' exclusive economic zone. China's Southern Theater Command countered by claiming the Philippine plane intruded into China's airspace over Scarborough Shoal and violated Chinese sovereignty. This incident represents the latest escalation in the ongoing territorial dispute over the South China Sea, a vital waterway that facilitates more than $3 trillion in annual commerce.