TAIPEI (Taiwan News) — China sent a Shaanxi Y-8 anti-submarine warfare plane into Taiwan’s air defense identification zone (ADIZ) during Christmas Day Saturday (Dec. 25), according to the Ministry of National Defense.

Each time an incursion happens, the Air Force sends aircraft, issues radio warnings to the Chinese planes, and deploys air defense missile systems to monitor their activities.

As on most previous occasions since the military started publishing daily information about the incursions in September of last year, the aircraft appeared in the section of the ADIZ southwest of Taiwan’s main island, CNA reported.

The highest concentration of incursions took place in early October, with a record 56 aircraft involved on Oct. 4. The period coincided with China’s National Day on Oct. 1 and Taiwan’s National (Double Ten) Day on Oct. 10.