Russia is accusing British forces of the bombing of its Black Sea naval base.
A number of drones are reported to have attacked the naval base of Crimea's Sevastopol.
Russia is suspending a Ukraine grain export deal as a result.
UK correspondent Gavin Grey says Ukrainian reports say the attack has caused substantial damage while Russia is reporting there's only minor damage to one ship.
He says Russia is now saying they believe the Royal Navy was behind the attack, helping Ukraine direct the drones to attack their fleet.
But British forces are saying this is not true.
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