Four Chinese coast guard ships pushed into restricted waters around Taiwan's Kinmen islands, another squeeze in the slow-burning pressure campaign against Taipei.

• The ships entered from two directions in the afternoon and left about two hours later.
• Taiwan sent patrol boats to shadow each ship one-on-one and broadcast warnings in Chinese and English to push them out.
• Taiwan's coast guard called it "gray zone" pressure — harassment short of war, paired with false information meant to muddy who controls the waters.
• China's fishing ban season just ended, so large numbers of Chinese boats are now at sea and crossing into neighbors' waters.
• Taiwan says it has been running sweeps near Kinmen to drive out boats that cross the line.

Outlook: Expect more of these incursions as Chinese fishing fleets stay out in force and Beijing keeps testing Taiwan's control of the Kinmen strait.