Russian attack planes buzzed the USS Donald Cook, a U.S. Navy destroyer, in the Baltic Sea coming as close as an estimated 30 feet from the ship officials said.
The Russian Su-24, a supersonic, all-weather attack aircraft, appeared unarmed but flew what the commander of the destroyer deemed to be a simulated attack profile.
The Cook's commander judged the actions unsafe and unprofessional. The ship took no action beyond trying unsuccessfully to communicate with the aircraft by radio, according to a statement by U.S. European Command.
The Associated Press contributed to this report.