Russia accused Britain and the United States on Friday of trying to incite conflict in the Black Sea and said it would defend its borders using all possible means, including military force.

Deputy Foreign Minister Sergei Ryabkov was speaking a day after Moscow warned Britain it would bomb British naval vessels in the Black Sea if what it called provocative actions by the British navy were repeated off the coast of Russia-annexed Crimea.

Britain rejected Russia’s account of the incident. It said it believed any shots fired were a pre-announced Russian “gunnery exercise”, and that no bombs had been dropped.