Originally Posted by
ORAC
The norm for exercises is to issue a NOTAM. Especial care is taken where these state they are live fire exercises. They could, of course, engage any aircraft which penetrate the NOTAM area, but that has far higher risks of its own.
ADIZ have no international legal basis. China has established one which, whilst being a matter of concern for airlines, is being ignored by the US forces and others. The US, UK and others have a tradition of deliberately challenging attempts by nations to use such means to limit transit of international waters and airspace - which is covered by international law.
East China Sea ADIZ
https://en.wikipedia.org/wiki/Freedom_of_navigation
Thank you, that is very helpful. Do we know whether China issued a NOTAM for the exercise area as well as setting up the ADIZ?