BEIJING, Sept. 30 -- On September 30, naval and air units of the PLA Southern Theater Command (STC) conducted readiness patrols in the territorial sea and airspace of China's Huangyan Dao and its surrounding areas. Huangyan Dao is China's inherent territory. Since September, forces of the STC have strengthened readiness patrols in the territorial sea and airspace of Huangyan Dao and its surrounding areas. Such patrols are aimed at further enhancing control of relevant sea areas and airspace and serve as an effective countermeasure to cope with all sorts of rights-violation and provocative acts. Forces of the STC will resolutely safeguard China's sovereignty and security and firmly uphold peace and stability in the South China Sea.