TAIPEI (Taiwan News) — A Chinese warplane briefly entered Taiwan’s Air Defense Identification Zone (ADIZ) Saturday (July 4), according to Air Force Command.

The latest incident marks the 10th such intrusion since June 9, according to the authorities. Saturday’s occurred in the morning off Taiwan’s southwest coast, the same area as most previous incidents.

A Taiwanese jet had to issue a warning before the Chinese warplane left the ADIZ, CNA reported. Defense sources did not identify the type of Chinese aircraft involved.

Tensions in the region have been mounting as China introduced a draconian national security law for Hong Kong on July 1, provoking a new wave of protests in the territory as well as eliciting concern from many democracies across the world.

The communist country has been conducting five days of military drills in the South China Sea. Meanwhile, the United States Navy is preparing for its largest maneuvers in the area since 2014 by sending over the aircraft carriers USS Ronald Reagan and USS Nimitz.