Chinese vessels patrols in disputed islands at East China Sea

China conducts such patrols on a regular basis, the State Oceanic Administration said. Tensions have been rising between traditional foes China and Japan since 2012 over the disputed islands in the East China Sea. Over the years, China has become increasingly aggressive in seas, asserting its claims over the South China Sea and patrolling its ships in Indian Ocean and East China Sea. Recently, its only aircraft carrier — flanked by warships — sailed into the contested South China Sea.