FILE - In this Sunday, Jan. 10, 2016, file photo, a U.S. Air Force B-52 bomber flies over Osan Air Base in Pyeongtaek, South Korea. China has labeled a recent mission by nuclear-capable U.S. B-52 bombers over the disputed South China Sea as "provocative" and says it will take all measures considered necessary to safeguard its rights and interests. (AP Photo/Ahn Young-joon, File)
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