Nearly 10 Chinese and Russian military aircraft briefly entered and left South Korea's air defense identification zone (KADIZ) above the country's eastern and southern waters.

Axar.az reports, citing Yonhap News Agency, the Chinese and Russian military aircraft did not violate South Korea's airspace, according to the Joint Chiefs of Staff (JCS), adding that it detected the aircraft before they entered the air defense zone.

The South Korean military dispatched Air Force fighter jets to prepare for any possible contingencies.

The air defense zone is not territorial airspace but is delineated to call on foreign planes to identify themselves so as to prevent accidental clashes.

The brief entry appears to have occurred during joint air drills between the two countries, according to a JCS official.