He said an unpredictable and nuclear-armed North Korea presents the most danger to the world within his area of military command, which stretches from waters off the west coast of the U.S. to the western border of India.
Locklear also stressed the importance of preventing territorial disputes in the Asia-Pacific that could be resolved through international law and compromise from becoming regional flashpoints.
China, in particular, has long-running disputes with many of its neighbors, including U.S. ally Japan. The two Asian nations have competing claims to remote islands in the East China Sea and that's stoked tensions.
China last week accused a Japanese naval and air patrol of disrupting a recent Chinese military drill that was using live ammunition. Japan denied it.
Locklear said it was not abnormal for Japan to have observed the Chinese exercises the way they did and Japan's action should not be viewed as provocative.