McCallum identified Russia as the primary state adversary, describing it as “aggressor number one.” While acknowledging that Russia’s full-scale invasion of Ukraine has resulted in “minimal” territorial progress at a “horrifically costly” human and material price, the MI5 chief argued that Moscow is compensating for battlefield stagnation by destabilizing European nations through non-military means. These hybrid activities include cyber-attacks, sabotage, and the deployment of proxies. McCallum stated that successful MI5 operations have “eviscerated” the Kremlin’s traditional covert footprint, citing the expulsion of nearly 1,000 Russian spies since the invasion began. Consequently, Moscow has increasingly turned to paying criminals and proxies to execute attacks, a tactic McCallum characterized as evidence that Russia lacks the “strategic upper hand” of a great power.
Beyond Russia, the intelligence chief highlighted rising aggression linked to Iran, particularly against Jewish sites and military bases, and noted growing threats from China. The convergence of these state-level threats with domestic security risks has created a complex operational environment. McCallum noted that the workload for countering terrorism and state threats is now “pretty much of equal scale,” a development he described as a “huge shift” in recent years. This parity suggests that the threat landscape in Britain is no longer dominated solely by ideological extremism but is equally shaped by the strategic interests of hostile foreign powers.
Artificial intelligence has emerged as a critical accelerant in this evolving threat environment. McCallum warned that AI is “supercharging the cyber-security contest between attackers and defenders.” He revealed that MI5 teams have already intercepted terrorists seeking to exploit AI to enhance their reconnaissance and attack methodologies. A specific concern is the integration of AI with drone technology, which adds a new dimension to potential physical attacks. Furthermore, the Director General flagged the potential for extremist groups to use AI to harness new and existing bioweapons, a risk he described as real and immediate.
In response to these emerging challenges, MI5 has launched the AI Threat Assessment Centre (AITAC). Housed within the Security Service, the center draws on expertise from multiple bodies to produce all-source assessments aimed at “separating the bluster from the realities.” McCallum emphasized the need for sober assessment of AI-driven threats, noting that while the benefits of the technology are tangible, so are the national security risks. The UK Intelligence Community, comprising MI5, the Government Communications Headquarters (GCHQ), and the Secret Intelligence Service (MI6), is collaborating with the UK’s AI Security Institute to retain a capability edge against those seeking to harm the nation.
The domestic security landscape also includes rising threats from extreme right-wing terrorism. McCallum noted that while state threats have surged, the risk from domestic extremism remains significant. He addressed recent political commentary regarding Russian interference in the Brexit referendum, distinguishing between “interference attempted” and “outcome achieved,” while confirming that Moscow had attempted such interference. The MI5 chief’s remarks come as European leaders increasingly warn of potential Russian attacks designed to test Western commitments to Ukraine.
As the line between state-sponsored hybrid warfare and non-state terrorism blurs, British intelligence agencies face the dual challenge of protecting critical infrastructure from cyber-attacks while countering physical threats enabled by advanced technology. The establishment of the AITAC signals a strategic pivot toward proactive assessment of AI risks, acknowledging that the tools of the future will define the security challenges of the present.
