In this Sept. 14, 2014, file photo, locals on a warehouse rooftop display the national flag while watching Taiwan fighter jets practice during military exercises in Chiayi, central Taiwan. Taiwan reported on Sept. 18 that China had sent 18 planes into its airspace defense identification zone, prompting the island nation to scramble fighter jets and put its air-defense system on alert. (AP Photo/Wally Santana, File) **FILE**
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