Four Russian crewmembers die in Sea of Japan collision
One of the sailors has been picked up by a South Korean patrol ship which was sent to the rescue, a coastguard official told the media.
The incident happened on early morning some 16 nautical miles from the Korean port city of Ulsan.
A preliminary investigation said the vessel “Aleksandra” may have collided with another vessel.
The rescue operation is still underway. A helicopter and several patrol boats are involved in the search and rescue operation.