China announced it conducted a routine patrol by its naval and air forces in the South China Sea, while accusing the Philippines of organizing joint patrols with foreign countries that undermine regional peace and stability. The comments came from the Southern Theatre Command of the People's Liberation Army, with spokesperson Colonel Zhai Shichen stating that the forces would "resolutely defend national territorial sovereignty and maritime rights and interest, firmly maintaining regional peace and stability." The drills involving the US and Japan occurred amid escalating tensions in the disputed waterway. China claims sovereignty over almost the entire South China Sea, despite overlapping claims by Southeast Asian nations, and rejects a 2016 arbitral ruling that invalidated its claims.