China has claimed all the waters of the South China Sea from the Koreas to the Straits of Malacca as their national territorial waters. They have used this as the pretext to occupy and militarize a number of islands and shoals that properly belong to Vietnam, the Philippines, Malaysia and Indonesia, and has sent in their fishing fleet in to basically rape the fisheries of these nations. The Chinese have been absolutely brutal in enforcing their claims at sea, primarily by interfering with navigation using shockingly unsafe bully tactics.
Despite have far fewer resources the Philippines have been fighting back.
Your Irascible Correspondent knows the Filipino people to be a race to be doughty warriors. The CCP blackguards don’t quite know what they’ve gotten themselves into. They are beginning to find out.