The figure was revealed by the head of MI5, Ken McCallum, in his annual update on threats facing the UK.But he said Russia had suffered a strategic setback after a mass expulsion of its spies around the world in the wake of its invasion of Ukraine.Last week it emerged that Iranian journalists based in the UK had received warnings from the police about potential risks to their lives.He said he could not provide further details of the potential plots but said Iran had sometimes operated using their own spies and sometimes others to work on their behalf utilising a combination of tactics, sometimes taking actions within Western countries and sometimes trying to lure people back to Iran.Moscow will continue to use a mixture of covert threats - like spies and cyber-attacks - as well as more open means like pressure on energy prices and disinformation to target the UK, he warned."