China's newly-enacted Coast Guard Law allows the agency to “take all necessary measures, including the use of weapons, when national sovereignty, sovereign rights, and jurisdiction are being illegally infringed upon by foreign organizations or individuals at sea." This includes the use of small arms, based on the "nature, degree and urgency" of the case and the personnel's "reasonable judgement." In the event of serious non-compliance, the use of deck guns would be permitted.
The law also empowers the CCG to halt construction or destroy foreign structures on Chinese-claimed land features, like those on the Philippine-occupied Pag-asa Island and Second Thomas Shoal. It gives the CCG broad discretion to set up temporary exclusion zones and to board and inspect foreign vessels within Chinese-claimed waters.