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MI5 chief Ken McCallum says Britain’s domestic intelligence service is devoting more resources to countering state threats than it did during the Cold War. He described Russia as “aggressor number one” and said Russian intelligence is relying on criminals after Russian agents were expelled from the U.K.

Britain’s domestic intelligence agency, MI5, is devoting more resources to countering threats from foreign states than it did during the Cold War, its chief, Ken McCallum, said. McCallum called Russia “aggressor number one,” describing its activity as a security concern for Britain and other European countries.

McCallum said Russia is seeking to conduct “hybrid warfare” in Europe and destabilize European countries while making what he characterized as “minimal and horrifically costly” progress in its war against Ukraine. Those assessments were presented as the MI5 chief’s account of Russian intentions and the course of the war, rather than as independently established findings in the report.

He said that after Russian agents were expelled from the United Kingdom, Russian intelligence services were “scrambling to pay criminals” to carry out work for them. The report did not specify how many agents were expelled, when the expulsions took place, or what operations were allegedly assigned to criminals.

McCallum argued that this reported reliance on criminal intermediaries reflected a setback for Moscow. “These are not the actions of a great power with the strategic upper hand,” he said. The report did not provide figures for MI5’s staffing, spending or the proportion of its resources now directed at state threats.

At a glance
reportWhen: Reported October 13, 2026
The developmentMI5 chief Ken McCallum says the agency is committing more resources to state threats than during the Cold War and identifies Russia as its leading foreign concern.

MI5’s Expanding State-Threat Mission

The comparison with the Cold War signals the scale of the current state-threat workload as described by MI5’s chief. It suggests the agency is assigning greater effort to foreign-government activity than in a period when confrontation with the Soviet Union shaped British security planning. The report gives no budget or staffing breakdown, so it does not show precisely how that shift is being measured.

The issue also reaches beyond intelligence collection. McCallum’s remarks link the threat assessment to alleged efforts to destabilize European countries and to Russia’s war against Ukraine. If criminal intermediaries are being used for intelligence-linked activity, the distinction between conventional espionage and other forms of hostile action can become harder for authorities to address. The specific incidents behind McCallum’s account were not detailed in the report.

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Russian Activity After Agent Expulsions

McCallum’s comments come amid a broader European debate about suspected Russian sabotage and other activity directed at countries supporting Ukraine. The report says officials in Germany, France and Poland have previously accused Russian authorities of trying to carry out acts of sabotage intended to intimidate Ukraine’s allies. Those are attributed claims; the report does not describe particular cases or provide evidence for them.

The remarks connect that European concern with a change in how Russian intelligence is said to operate in Britain. According to McCallum, the expulsion of Russian agents has pushed the services to seek criminal help. The report does not establish how this alleged shift relates to the wider European incidents, or whether the same actors or methods are involved.

“Russia remains “aggressor number one.””

— MI5 chief Ken McCallum

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Details Behind MI5’s Assessment

The report does not explain how MI5 calculated that it is committing more resources than during the Cold War, or whether the comparison concerns staff, funding, operational capacity or another measure. It also gives no totals for current resources or for changes over time.

Details of the alleged criminal recruitment remain limited: the report names no individuals, incidents or specific tasks. It is also unclear what evidence supports the assessment that Russia is seeking to destabilize European countries, and how much of the activity McCallum described is directed at Britain specifically. The claims are attributed to the MI5 chief and should not be read as a full public accounting of the agency’s intelligence.

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Further Detail on Threat Priorities

The report does not identify a scheduled announcement, new policy or operational milestone. Readers will need further statements from MI5 or the British government to learn whether the resource comparison will be accompanied by figures on budgets, staffing or threat activity.

More information may also clarify the alleged use of criminals by Russian intelligence and the nature of the European activity described by McCallum. Until such details are made public, the scale and specific examples behind the assessment remain unknown.

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Key Questions

What did MI5’s chief announce?

Ken McCallum said MI5 is devoting more resources to countering state threats than it did during the Cold War. The report does not specify the measure used for that comparison.

Why did McCallum single out Russia?

He called Russia “aggressor number one” and said it is seeking to destabilize European countries through what he described as hybrid warfare. These are McCallum’s assessments as reported by Meduza.

What did McCallum say about Russian intelligence in Britain?

He said that after Russian agents were expelled from the U.K., Russian intelligence services were seeking to pay criminals to do their bidding. The report gives no specific cases or names.

How does the Cold War comparison work?

The report does not say whether the comparison is based on MI5 staffing, spending, workload or another measure. It provides no supporting figures.

What remains unknown?

The scale of the resource shift, the evidence behind the alleged criminal recruitment and the specific operations at issue are not detailed in the report. Further public information from MI5 or the British government would be needed to clarify them.

Source: rss

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