4 . Military planes go on patrol in the Air Defense Identification Zone (ADIZ) in East China Sea
China announced the establishment of an Air Defense Identification Zone in East China Sea on November 23, 2013 and the PLA Air Force flied two large reconnaissance planes for the first air patrol in the ADIZ on the same day. Five days later, the PLA Air Force called out Su-30 and J-11 fighters for normalized air patrols in the ADIZ.