In this undated file photo by China's Xinhua News Agency, two Chinese SU-30 fighter jets take off from an unspecified location to fly a patrol over the South China Sea. (Jin Danhua/Xinhua via AP, File)
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In this undated file photo by China's Xinhua News Agency, two Chinese SU-30 fighter jets take off from an unspecified location to fly a patrol over the South China Sea. (Jin Danhua/Xinhua via AP, File)
