"Whether it is a tactical at-sea encounter, or strategic dialogue, sustained and reliable communication mitigates the risk of mishaps, which is in the interest of both the U.S. and China," the official said in an email to Reuters.
Security expert Thayer said the incident was the most significant since five Chinese ships harassed a U.S. oceanographic research vessel, the USS Impeccable, in 2009, also in the South China Sea.
"There have been hints of other incidents that both sides have apparently kept quiet but not this time," he said.
"The U.S. is determined to stand by its rights in international waters and is clearly expecting China to act accordingly." (Additional reporting by Manuel Mogato in MANILA and Greg Torode in HONG KONG; Editing by Jim Loney, David Brunnstrom and Michael Perry.)
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