This undated photo provided by the U.S. Air Force shows the WC-135W Constant Phoenix aircraft during flight. A pair of Chinese fighter jets conducted an "unprofessional" intercept of an American radiation-sniffing surveillance plane over the East China Sea, the U.S. Air Force said Friday, May 19, 2017, the latest in a series of such incidents that have raised U.S. concerns in an already tense region. (U.S. Air Force via AP)
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