A Russian spy ship has sunk off the Turkish coast after being breached in a collision with a freighter, with all its crew rescued, the Turkish coastal authority says.
Russia confirmed earlier that the hull of the Liman, part of its Black Sea Fleet, had sustained a breach, with crew working to keep it afloat.
The cause of the collision is unclear but fog was reported in the area.
The ship hit a Togo-flagged boat carrying livestock, Turkish media say.
Turkish Prime Minister Binali Yildirim called his Russian counterpart, Dmitry Medvedev, to express his sadness over the collision, sources in the Turkish prime minister's office were quoted by Reuters news agency as saying.
The Russian Black Sea Fleet passes through the Bosphorus Strait for deployments in the Mediterranean, notably in Syria.
All 78 crew aboard the Liman were safely evacuated, the Turkish coastal authority said in a statement (in Turkish) on its website.
It collided with the Youzarsif H freighter, reportedly 29km (18 miles) from the Turkish town of Kilyos on the Black Sea coast just north of the city of Istanbul, and had sunk by 14:48 (11:48 GMT). The freighter reportedly sustained minor damage in the incident.