Moscow has blamed Ukraine for a series of attacks by sea drones on Russian naval targets.
BBC research suggests at least 12 attacks have allegedly targeted Russia's navy - including military ships.A Russian tanker has been hit in a Ukrainian attack in the Black Sea, according to Russian officials. A Ukrainian security source has told the BBC that the strike was carried out by a sea drone.
There are many terms used to describe them, including drone boats, drone ships and uncrewed surface vessels . Several sea drones have been pictured since the start of the war, including one which reportedly washed up on the shores of Russian-occupied Crimea.How do sea drones work and how much do they cost?
Russian media and bloggers have claimed that Russia also used them in an attack on a bridge in the port city of Odesa. However, the BBC has seen no evidence to support this. Compared with naval vessels, sea drones are harder to detect on radar because they travel low on the water and they make far less noise.
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