The head of Britain's domestic spy agency on Tuesday accused Russian military intelligence of being on a "sustained mission" to cause mayhem in Britain and Europe.
McCallum said a total of 43 late-stage attack plots had been foiled by MI5 and police since 2017, noting that some plotters were seeking to get hold of firearms and explosives "in the final days of planning mass murder."
The spy chief said the agency was having to deal with a "dizzying range" of beliefs and ideologies, citing risks posed by Russia, Iran, China and others.
McCallum said the number of state threat investigations MI5 is running had jumped 48% in the last year.
"The U.K.'s leading role in supporting Ukraine means we loom large in the fevered imagination of [Russian President Vladimir] Putin's regime, and we should expect to see continued acts of aggression here at home," McCallum said.
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