President Ma Ying-jeou (馬英九) yesterday said that China’s declaration of an air defense identification zone (ADIZ) over an area of the East China Sea does not involve “air space” or “territorial sovereignty,” but that Taiwan will express its “serious” concern to China and other parties.

It is the first time Ma has commented on Beijing’s ADIZ move, which was announced on Saturday and has generally been viewed as upping the ante in China’s confrontation with Japan over the disputed Diaoyutai Islands (釣魚台) — known to Japanese as the Senkaku Islands — which Taiwan also claims sovereignty over.