Japan has provoked China again!

Japan was trying to harass China's aircraft carrier (Liaoning) exercise in international water and airspace by sending its F15 to breach its exercise zone.  As a result, China had to send its J15 to ward off Japanese F15 by locking fire-control radar on F15.  This was not the first incident because Japan also provoked China in 2016.

https://sg-stock.blogspot.com/2016/10/japan-f15-was-no-match-for-china-su-30.html

In 2016, Japanese F15s were locking fire-control radar on Chinese SU-30 and China engaged in a dog fight that sent the F15s scrambling back to Japan.