The Joint Chiefs of Staff pointed out, "Today, at 10:10 am, five airplanes of Chinese nationality were caught entering KADIZ from the west to the west, and our air force flew in an emergency."
The JCS said, "The Chinese nationality aircraft flew through JADIZ (Japan Air Defense Identification Area) and finally departed from KADIZ in the western part of KADIZ even after 1:47 pm via KADIZ."
The Chinese military aircraft entering KADIZ are known to be two H-6 strategic bombers, two J-11 fighters, and one TU-154 reconnaissance aircraft.
http://www.yonhapnews.co.kr/politics/2017/12/18/0503000000AKR20171218107452014.HTML