A Chinese naval Z-9 helicopter prepares to land aboard the People's Liberation Army (Navy) frigate CNS Huangshan (FFG-570) as the ship conducts a series of maneuvers and exchanges with the Arleigh Burke-class guided-missile destroyer USS Sterett (DDG 104) in the South China Sea June 16, 2017. U.S. Navy photo by Mass Communication Specialist 1st Class Byron C. Linder/Handout via REUTERS
