A Russian naval reconnaissance ship has sunk after it crashed into a freighter carrying livestock in the Black Sea, near Turkey.

Russia's defence ministry said the Liman was holed as a result of the collision that happened on Thursday about 40km (25 miles) northwest of the Bosphorus Strait, in foggy conditions.

All 78 personnel aboard were rescued, it was reported. The freighter's crew is also thought to be safe.

Sky News reported the ship had sunk, citing Turkey's coastal safety authority.

A separate dispatch had suggested 15 Russian soldiers were missing after the crash.

The transport vessel was flying a Togo flag and was identified as Youzarsif H by the GAC shipping agent.