内容摘要：HONOLULU (AP) — Defense chiefs from the U.S., Australia, Japan and the Philippines vowed to deepen t

HONOLULU (AP) — Defense chiefs from the U.S., Australia, Japan and the Philippines vowed to deepen their cooperation as they gathered Thursday in Hawaii for their second-ever joint meeting amid concerns about China’s operations in the South China Sea.

The meeting came after the four countries last month held their first joint naval exercises in the South China Sea, a major shipping route where Beijing has long-simmering territorial disputes with a number of Southeast Asian nations and has caused alarm with its recent assertiveness in the waters.

U.S. Defense Secretary Lloyd Austin told reporters at a news conference after their discussion that the drills strengthened the ability of the nations to work together, build bonds among their forces and underscore their shared commitment to international law in the waterway.

Australian Defense Minister Richard Marles said the defense chiefs talked about increasing the tempo of their defense exercises.