An Estonian cargo ship has sunk off the Ukrainian Black Sea port of Odesa after an explosion.
The ship's owners say the crew abandoned the ship, but four members are unaccounted for.
The vessel had been anchored off the coast after leaving port several days ago.
Ukrainian media say the Russian navy had been using the cargo ship as a shield to hide from Ukrainian weaponry.
Baltic state Estonia is a member of NATO and has a border with Russia.
Ukraine's military says Russia is sending amphibious landing vessels to capture Odesa, a city of a million people and a major seaport, as it continues its advance across southern Ukraine.
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