China's claims in the South China Sea overlap with those of the Philippines, which is a U.S. security treaty ally.

The Philippines and the United States carried out joint maritime exercises for a fifth time in the South China Sea, Manila's armed forces said on Sunday, in a move that would likely irk China.

The Chinese military on Sunday conducted "combat readiness patrols" at a disputed South China Sea reef in the maritime zone of the Philippines ... operations aircraft, a Su-30 fighter jet and ...