In this file photo, China's People's Liberation Army displays DF-26 ballistic missiles in a parade. Over just the past several months, major revelations about the extent of China's hypersonic weapons capabilities, its nuclear arms stockpile, and even the size of its navy have sparked concerns that Washington may not have a full window into exactly what its 21st-century rival has up its sleeve, or what may be under development deep inside the communist nation. (Associated Press/File)
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