SOUTH CHINA SEA: The U.S. and Japan have conducted a joint naval exercise.

The Japanese newspaper and All-Nippon News Network reported the exercises mark the first time a U.S. aircraft carrier and Japan’s maritime SDF trained together in waters where China has been flexing its muscles with the rapid militarization of disputed islands in the South China Sea.

Nope, Beijing isn’t pleased.

RELATED: China’s slow and deliberate imperial war in the South China Sea.