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The Ukrainian military says a large Russian ship has been destroyed near the southern port city of Berdyansk.

In a post on Facebook, Ukraine's Navy says a large landing vessel - the "Orsk" - was hit and set ablaze in the Sea of Azov this morning.

"The Orsk large landing ship of the Black Sea Fleet of the occupiers has been destroyed in the port of Berdyansk captured by Russia," the post says.

Ukrainian media report that one Russian ship has sunk and two others are on fire, and that an ammunition depot and a fuel warehouse were hit.

It is not possible to confirm this information from other sources.

Russia captured Berdyansk weeks ago and has been using the port for refuelling. It lies between Crimea and the besieged city of Mariupol.