A total of six Chinese and Russian warplanes briefly entered South Korea's air defense zone without notice on Tuesday.
But they did not enter the country's airspace.
Seoul's Joint Chiefs of Staff said two Chinese warplanes flew into KADIZ at about 8AM, and stayed for about an hour and a half before moving away.
About two hours later, four Russian military aircrafts also flew into the air defense zone before flying away about fifteen minutes later.
In response, the South Korean military reportedly sent F-15K and KF-16 fighter jets to prevent the warplanes from further entering the nation's airspace.
This appears to be have happened while China and Russia held their first joint military exercise since Russia's invasion of Ukraine, during Biden's visit to the region.