TAIPEI (Taiwan News) — A total of 15 Chinese military aircraft, including 12 fighter jets, intruded into the southwestern part of Taiwan’s air defense identification zone (ADIZ) in one single day, reports said Wednesday (April 7).

While incursions have occurred almost on a daily basis for several months, the number of the People’s Liberation Army Air Force (PLAAF) aircraft involved has sharply varied. Analysts have linked this week’s activity with the move south of China’s Liaoning aircraft carrier.

The planes involved in Wednesday’s incursions were eight J-10 fighters, four J-16 fighters, two KJ-500 airborne early warning and control planes, and one Y-8 anti-submarine aircraft, CNA reported.

When Chinese military planes enter Taiwan’s ADIZ, the Air Force will sometimes scramble jets, issue radio warnings to tell the Chinese aircraft to turn back, and deploy its air defense missile system to monitor the activity.