Seoul said on Friday that it had scrambled military jets to intercept a Chinese military aircraft that entered South Korean air-defense territory. The Chinese plane spent more than four hours in the Korea Air Defense Identification Zone (ADIZ) after flying near a submerged rock in the area controlled by Seoul but claimed by Beijing, according to Seoul’s joint chiefs of staff. South Korea’s Air Force deployed more than one fighter jet to track and blare warnings to the Chinese aircraft to leave, Reuters reports. Beijing has not commented on Seoul’s statement. The ADIZs are not legally binding agreements under international treaties. However, Seoul extended its own territory in 2013 to partially overlap with a zone newly declared by China.