An air defense identification zone (ADIZ) is a region of airspace in which a country tries to identify, locate, and control aircraft in the interest of national security.[1] It is declared unilaterally[2] and may extend beyond a country's territory to give the country more time to respond to possibly hostile aircraft.[3] The concept of an ADIZ is not defined in any international treaty and is not recognized by any international body.[3][4]
中国军舰、潜艇和轰炸机突然出现在阿拉斯加附近，美国议员惊呼中国的“自由航行”威胁了美国的国家安全
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