MANILA, Philippines — For the first time since Beijing’s declaration, the China Coast Guard (CCG) has been broadcasting radio challenges to assert its unilateral “nature reserve” claim in Scarborough (Panatag) Shoal. These broadcasts specifically target Filipino fishermen operating in the area, the Philippine Coast Guard (PCG) said on Monday.

The PCG documented these radio challenges during the operations of its ships and the Bureau of Fisheries in the disputed waters. This development marks a new level of assertiveness from China regarding its claims over Scarborough Shoal, a territory also claimed by the Philippines.
https://www.inquirer.net/457746/2-in-radio-challenge-china-claims-ph-fishers-may-ruin-their-scarborough-nature-reserve/