A Russian warship carried out "unprofessional" maritime operations in close proximity to a U.S. Navy ship in the eastern Mediterranean Sea, a U.S. Defense Department official said Friday.

This was the second time in June that the same Russian vessel has come within close proximity of a U.S. Navy ship.

On June 17, the Yaroslav Mudryy came within 315 yards (288 meters) of the USS Gravely, an incident U.S. officials called "unsafe and unprofessional," but which the Russian Defense Ministry disputed.