Russia's intelligence agency has been on a mission to generate "mayhem on British and European streets", the head of MI5 has said, as he warned the UK faces the most "complex and interconnected" threat it has ever seen.
There has also been 20 Iran-backed plots since 2022, the director general Ken McCallum said.
He said the complex mix of terror-related threats and threats from nation states meant that MI5 had "one hell of a job on its hands".
A total of 43 late-stage attack plots on the UK have been foiled since 2017, he said, with some plotters trying to "get hold of firearms and explosives".
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