TAIPEI (Taiwan News) — Three Chinese Y-8 aircraft intruded into the southwest sector of Taiwan’s Air Defense Identification Zone (ADIZ) Friday (Dec. 4), according to the Ministry of National Defense.

As on numerous previous occasions over the past few months, Taiwan’s Air Force scrambled jets, issued radio warnings to the Chinese aircraft and deployed air defense missile systems to monitor their activity, CNA reported.

The Y-8 planes spotted Friday were of three different types, an anti-submarine aircraft (Y-8 ASW), an electronic warfare plane (Y-8 EW) and a tactical reconnaissance aircraft (Y-8 RECCE).

The latest incursions amounted to the third such incident this week, showing no letup in what has generally been interpreted as a campaign of intimidation by China. In October, the military recorded ADIZ violations on 22 out of 31 days and in November on 22 out of 30 days.