Taiwan keeps tabs on Chinese military planes and ships as they travel the country.

Eight Chinese military planes and eleven navy vessels were monitored by Taiwan between 6 a.m. on Saturday (May 27) and 6 a.m. on Sunday (May 28), according to Taiwan News.

Four of the eight People’s Liberation Army (PLA) aircraft, according to Taiwan’s Ministry of National Defense (MND), breached the Taiwan Strait median line in the country’s air defense identification zone (ADIZ) in the northeast.

According to MND, the aircraft consisted of two Chengdu J-10 jet fighters and two Sukhoi Su-30 combat planes.

According to Taiwan News, one Shaanxi Y-8 anti-submarine warfare plane was also seen near the southwest portion of Taiwan’s ADIZ.

In retaliation, Taiwan sent out aircraft, ships, and land-based missiles to observe PLA operations. Beijing has already this month launched 131 navy vessels and 304 military planes in the general direction of Taiwan.

Since September 2020, China has increased the number of military aircraft and naval ships that are monitoring the area near Taiwan as part of its use of “grey zone” tactics.