Iran and Russia ramping up hybrid campaigns in Britain, UK spy chief says

Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)
Director General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Oct. 13, 2026. (Jonathan Brady/PA via AP, Pool)

Iran is ramping up attempts to hit harder targets such as military sites in Britain while Russia is escalating its hybrid warfare as it lashes out against Ukraine’s allies, the UK’s domestic spy chief says.

In his annual speech on wide-ranging threats to Britain, MI5’s Director General Ken McCallum also says the greatest concern about the misuse of AI was terrorists being able to develop bioweapons or even create new novel pathogens.

McCallum says state threats have quadrupled over the last decade, meaning his organization now devotes more resources to the issue than during the Cold War.

Yesterday, British Prime Minister Andy Burnham said Tehran was “highly likely” behind a suspected plot against RAF Fairford, which had been used by US bombers to carry out strikes on Iran. It prompted a massive security alert and led to US President Trump withdrawing planes from the air base.

McCallum says he cannot speak about the Fairford incident because of an ongoing investigation, but he says there has been a major shift this year in “Iranian ambitions to come at harder targets, like military sites.”

“The RAF Fairfield incident… is not unique. There have been other examples, not just in the UK but around the world,” he says.

On Russia, which likewise denies involvement in hostile acts in Britain, the UK spy chief said it remained the “aggressor number one.”

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