MI5 Director General Ken McCallum warns that Iran and Russia are expanding hybrid warfare in the UK, committing state threat resources beyond Cold War levels. McCallum highlighted Iranian attempts to target harder UK military installations, following a September 2026 plot against RAF Fairford linked to Iran's Revolutionary Guard that prompted the US to withdraw bombers. Russia remains designated as top aggressor, deploying criminal proxies and cyber operations, while MI5 launches a new center to counter rising threats of AI-assisted terrorism and potential bioweapons.
MI5 resource allocation
- ▪MI5 is devoting more resources to countering state threats than during the Cold War, balancing operational missions equally between state threats and terrorism
- ▪MI5 Director General Ken McCallum stated on October 13, 2026, that MI5's work countering state threats from Russia, Iran, and China has quadrupled over the past decade
- ▪The U.K. raised its national terrorism threat level to severe in April 2026, indicating an attack is highly likely
Iranian military site targeting
- ▪MI5 Director General Ken McCallum warned on October 13, 2026, that Iran is escalating efforts to attack harder UK targets, specifically military sites
- ▪Iran has carried out arson and sabotage attacks against British Jewish sites using hired proxies
- ▪MI5 reported 50 arrests in the UK over the past year related to Iran-linked hostile activities
Russian hybrid warfare tactics
- ▪European intelligence agencies cited Russian hybrid warfare tactics including an attempted drone strike on a German cargo plane and a cyber attack on Polish energy infrastructure
- ▪MI5 Director General Ken McCallum labeled Russia as 'aggressor number one' during his annual threat update speech on October 13, 2026
- ▪MI5 reported that nearly 1,000 Russian spies have been expelled globally since the invasion of Ukraine, forcing the Kremlin to pay criminal proxies for hostile operations
AI exploitation by terrorists
- ▪MI5 Director General Ken McCallum expressed concern that artificial intelligence could enable extremist groups to develop or synthesize novel bioweapons
- ▪MI5 established a dedicated AI Threat Assessment Center to evaluate risks and monitor hostile technological developments
- ▪Terrorists have attempted to exploit artificial intelligence for attack methodologies and reconnaissance, including AI-enabled drones
RAF Fairford suspected plot
- ▪British police arrested seven men in their 20s and subsequently released them on bail under investigation regarding the RAF Fairford base incident
- ▪British Prime Minister Andy Burnham stated on October 12, 2026, that the suspected security plot targeting RAF Fairford was almost certainly directed by Iran's Revolutionary Guard
- ▪U.K. authorities evacuated local residents on September 27, 2026, after discovering gasoline in three vans near RAF Fairford air base during a terror investigation
- ▪The United States withdrawn bombers from RAF Fairford following the September 2026 security alert at the base
Debatable claims
- ▪Russian hybrid attacks on European infrastructure constitute acts of armed conflict
- ▪State threats pose a greater risk to British national security than domestic terrorism
- ▪The United States should maintain bomber deployments at UK bases despite proxy threats
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