Taiwan's new defense minister said Monday the island nation would not recognize any air defense zone declared by China over the South China Sea, as its top security agency warned such a move could usher in a wave of regional tension.

U.S. officials have expressed concern that an international court ruling expected in coming weeks on a case brought by the Philippines against China over its South China Sea claims could prompt Beijing to declare an air defense identification zone (ADIZ) as it did over the East China Sea in 2013.

China claims most of the South China Sea, through which $5 trillion in ship-borne trade passes every year. The Philippines, Vietnam, Malaysia, Taiwan and Brunei have overlapping claims, as well as close military ties with Washington.