British Prime Minister Rishi Sunak was briefed by the Ministry of Defence (MoD) after a Russian submarine, Kazan, was sighted off Scotland’s west coast last week near a naval base at Faslane.
Kazan, which did not enter United Kingdom waters, was identified by an RAF Poseidon P8 anti-submarine aircraft as it passed Ireland on June 5 as part of routine monitoring.
The nuclear-powered submarine has left the Cuban capital of Havana with other Russian Navy vessels after a military drill in the Caribbean over the weekend.
Both the United States and Cuba played down the threat posed by the stopover, which was widely seen as a Russian show of force amid continued high tensions over the Ukraine war.