Four Chinese coast guard ships entered Japanese territorial waters in the East China Sea.
The vessels entered waters near the Senkaku Islands in Okinawa Prefecture, an area Beijing claims as disputed.
According to the Japanese Coast Guard, the Haijing-class ships entered waters near Minamikojima, part of the Senkaku archipelago, between 10:15 and 10:30 a.m. on Sunday and left the area around noon.
Tensions between Tokyo and Beijing have increased after Japan’s new Prime Minister, Sanae Takaichi, said this month that the use of military force in a conflict over Taiwan could be considered a “survival-threatening situation.”
This classification provides Japan with legal grounds for possible intervention.