Does an air defense identification zone (ADIZ) involve sovereignty? According to President Ma Ying-jeou’s (馬英九) administration, the answer is apparently not a definite “yes.”
On May 29, 2010, in a statement released in response to Japan’s proposed plan to expand its ADIZ westward, which would leave it overlapping parts of Taiwan’s ADIZ, the Ministry of Foreign Affairs said it found Japan’s decision unacceptable, as it would affect Taiwan’s airspace and national sovereignty.