South Korea says it has expanded its air defense zone following China's move to establish a similar zone that has been criticized by Beijing's neighbors.

South Korea earlier requested China to redraw its air defense zone because it partly overlaps with South Korea's but Beijing rejected it. The U.S., Japan and other countries have also protested the Chinese zone.

The new South Korean zone unveiled Sunday includes a submerged rock embroiled in territorial disputes with China and enlarged parts of air space that is also covered by the Chinese zone. The new South Korean zone also overlaps with parts of the Japanese air defense zone.

Seoul's Defense Ministry says it will discuss with neighboring countries steps to prevent accidental clashes within the South Korean zone.