According to the Head of Taiwan Defense Agency Yen Teh-fa, that Chinese military aircraft frequently appears in the Air Defense Identification Zone (ADIZ) of Taiwan may be part of Beijing's plan to establish ADIZ in Bien Dong Sea (internationally known as South China Sea).

The Philippines strongly opposed plans by China to declare an air defense identification zone (ADIZ) on air space above the South China Sea (called the East Sea in Vietnam), Manila’s defense chief said on June 25.