Russia and the United States on Friday accused each other of dangerous manoeuvres after their naval ships came close to collision in the East China Sea.
On Friday morning, Russia's Pacific Fleet said that the USS Chancellorsville guided-missile cruiser suddenly cut across the course of its Admiral Vinogradov anti-submarine ship, passing in front of it at a distance of just 50 metres (164 feet).
The Russian ship had to carry out an emergency manoeuvre to avoid collision, the navy said, adding that it had sent a message of protest to the US cruiser's commanders.
Admiral Viktor Kravchenko, Russia's former navy chief of staff, accused the US of "hooliganism" in comments to Interfax news agency.
In a later statement, the US seventh fleet attributed the incident to an "unsafe" manoeuvre by the Russian ship, which it said had accelerated from behind to sail within 50 to 100 feet of the Chancellorsville, "putting the safety of her crew and ship at risk."