It said Britain would also train dozens of Ukrainian navy personnel to use the drones.
"The UK is giving underwater drones to Ukraine and training Ukrainian personnel in Britain to use them to clear their coastline of mines," the British defence ministry said in a statement on Saturday.
"Six autonomous minehunting vehicles will be sent to the country to help detect Russian mines in the waters off its coast," it added.
"Dozens of Ukrainian Navy personnel will be taught to use the drones over the coming months, with the first tranche having already begun their training," the statement also said.
The UK defence ministry said Russia "has been weaponising food by destroying Ukrainian agriculture and blockading the country’s Black Sea ports to prevent exports, with devastating consequences for the world’s poorest people as food prices rise."
It noted in its statement that a small number of ships carrying grain have left Ukraine since the United Nations and Turkey in July brokered a deal between Kyiv and Moscow to allow food exports, but it said efforts to get food out of the country continued to be hampered by sea mines left by Russian forces along Ukraine’s coast.
Defence Secretary Ben Wallace said: "Russia’s cynical attempts to hold the world’s food supply to ransom must not be allowed to succeed."
He added: "This vital equipment and training will help Ukraine make their waters safe, helping to smooth the flow of grain to the rest of the world and supporting the Armed Forces of Ukraine as they look to defend their coastline and ports."
Ukrainian Foreign Minister Dmytro Kuleba said this week that all European nations except Austria and Hungary were sending military aid to his country to help it defend itself against Russia.
Sunday is day 186 of Russia's war in Ukraine.
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Source: IAR, PAP, Reuters, gov.uk