Ukraine has carried out a "massive" drone attack on the Black Sea Fleet in the Crimean port city of Sevastopol, damaging one warship, Russia has said.
Nine drones were used, a top official said. Ukraine has not commented.
Without providing evidence, Russia accused British troops of being involved in Saturday’s attack – and in blowing up gas pipelines last month.
In its response, the UK Ministry of Defence (MoD) said Russia was "peddling false claims of an epic scale".