BEIJING - The Chinese military has stepped up combat readiness patrols in the surrounding areas of and airspace over the territorial waters of Huangyan Dao since September, an official statement said on Wednesday.

The Chinese People's Liberation Army Southern Theater Command said that naval and air forces have been deployed to reinforce patrols and vigilance, further strengthen control and management of relevant areas, and effectively counter unlawful infringements and provocations.

The move aims to firmly safeguard China's sovereignty and security while maintaining peace and stability in the South China Sea, it added. 

Also on Wednesday, the China Coast Guard (CCG) said it has stepped up law enforcement patrols in the territorial waters off Huangyan Dao and surrounding areas since the beginning of September.

In a statement, the CCG said it has taken measures in line with laws and regulations - including verbal warnings and interceptions - to drive away vessels engaged in illegal infringement and harassment.

The operations have further strengthened the management and control of the related maritime area, the CCG said, vowing to firmly safeguard China's territorial sovereignty and maritime rights and interests.