MI5 Chief Warns of Escalating Hybrid Campaigns on British Soil as Iran-Led Attacks on Jewish Communities Are Called ‘Sickening’
The Head of Britain’s Domestic Security Agency Delivers a Stark Warning
The head of Britain’s domestic security agency has delivered a blunt and unsettling warning: Tehran and Moscow are dramatically escalating their hybrid campaigns on British soil, with state-directed efforts to intimidate, coerce, and destabilise communities now reaching levels that would have been unthinkable just a few years ago. In a rare public intervention, MI5 Director General Ken McCallum accused both Iran and Russia of conducting increasingly aggressive operations across the United Kingdom, and he reserved some of his harshest language for Iran, describing its involvement in attacks against Jewish communities as “sickening.” His words, carefully chosen and delivered with the weight of an intelligence professional who rarely speaks on the record, underscored a troubling new phase in the country’s national security landscape.
Hybrid warfare, a term that encompasses everything from cyber intrusions and disinformation to sabotage, espionage, and covert support for violent extremism, has moved from the margins of national security discussion to the centre of the British threat picture. For years, intelligence agencies focused heavily on Islamist terrorism and traditional espionage. But McCallum’s intervention makes clear that state actors are now using a far broader and more dangerous toolkit. He pointedly referenced Iran’s use of hostile networks and proxies to target Jewish communities, and he accused Moscow of pursuing similarly reckless tactics. The message is not simply that these activities are happening, but that they are accelerating, and that Britain’s open society has become a battleground in a much larger geopolitical struggle.
What makes this period particularly fraught is the combination of scale and impunity. McCallum did not disclose every operation his agency has disrupted, but he painted a picture of states that are willing to take risks, test boundaries, and adapt quickly when their methods are exposed. The threat is not theoretical. It is playing out in British cities and online networks, in courtrooms and community halls. And while the public may not hear about every plot that is foiled, the cumulative effect is a quieter, more insidious erosion of security that can leave citizens feeling vulnerable without fully understanding why.
Iran-Led Attacks on Jewish Communities: A Climate of Fear
Perhaps the most emotionally charged element of McCallum’s warning was his direct reference to Iran’s role in attacks on Jewish communities. He used the word “sickening” to describe operations that have targeted synagogues, Jewish schools, businesses, and communal institutions. These attacks, he suggested, are not random acts of hatred. They are directed, financed, and guided by Iranian state actors, often using criminal networks, third-country proxies, and digital tools to carry out intimidation and violence while maintaining a degree of deniability. This is not a fringe issue; it is a systemic campaign that has forced Jewish communities in Britain to reconsider their security arrangements, their daily routines, and even their future in the country.
The tactics employed by Iran are calculated to create maximum fear with minimal fingerprints. There have been credible reports of plots to assault prominent Jewish figures, to set fire to community buildings, and to intimidate families in their own homes. In some cases, perpetrators have been recruited online, sometimes for money, sometimes out of ideological alignment, and directed by intelligence officers operating far away from British jurisdiction. McCallum’s comments reflected a deep concern that these operations are becoming more brazen. The term “sickening” was not an exaggeration; it was a moral judgment, an acknowledgement that the victims are not just targets of political violence, but members of a community that has already endured centuries of persecution.
Jewish organisations have responded with a mix of relief and alarm. Relief that the security services are taking the threat seriously, and alarm because the threat has become so severe that such public statements are needed. Community leaders have repeatedly called for stronger protection, better intelligence sharing, and clearer legal consequences for those who facilitate or carry out attacks. McCallum’s use of language was intended to reassure those communities that the agency is watching, working, and willing to say uncomfortable things in public. But it also served as a call to action: the danger is not speculative, it is happening now.
Russia’s Shadowy Tactics on British Soil
While Iran’s focus on Jewish communities is deeply troubling, McCallum also made clear that Russia remains a formidable and persistent adversary. Moscow’s hybrid campaign on British soil is less about street-level violence and more about systemic disruption, but it is no less corrosive. Russian intelligence activities have included cyberattacks against critical infrastructure, disinformation campaigns designed to undermine public trust in democratic institutions, and the cultivation of agents and influencers who can spread Kremlin narratives across social media. In recent years, there have also been allegations of sabotage plots targeting businesses and infrastructure linked to Ukraine’s defence, as well as attempts to interfere in domestic political debates.
What alarms counterintelligence experts most is Moscow’s growing willingness to operate on Western soil with a level of audacity that recalls the deadliest days of the Cold War. The days when Russian spies were content to steal secrets quietly are fading. The modern Russian approach is often disruptive, aggressive, and designed to create chaos. McCallum’s comments suggest that British security services have detected a shift in Russia’s calculus: it is not merely interested in gathering information, but in actively harming British interests, weakening public confidence, and demonstrating that it can strike at the very heart of a Western democracy. The result is a constant, low-level battle that occupies thousands of intelligence analysts, cyber specialists, and police officers.
Part of the challenge is that Russian operations are highly adaptable. When one network is exposed, another emerges. When one strategy fails, another is devised. This is not a static threat, but a dynamic and evolving one, requiring the UK to invest continuously in new defensive capabilities and to stay several steps ahead of a very sophisticated opponent. McCallum’s warning about Moscow is not simply about espionage; it is about the broader strategic competition between open and authoritarian systems, and the lengths to which Russia is willing to go to destabilise its adversaries.
How MI5 Is Responding to the New Threat Landscape
The response to these escalating hybrid campaigns is unfolding on multiple fronts, and MI5 is at the centre of it. The agency has worked closely with counterterrorism police, regional organised crime units, and international partners to identify and disrupt Iranian and Russian networks operating in Britain. In many cases, operations are stopped before they become public knowledge, but the scale of the work is immense. McCallum’s public remarks were partly intended to dispel any notion that this is a threat the government is ignoring. The reality is far more complicated: the security services are stretched, and the demands on them are growing faster than resources.
One of the most difficult aspects of countering hybrid warfare is that it often operates below the threshold of traditional law enforcement. A cyberattack can be hard to attribute. A disinformation campaign can be dismissed as free speech. A threat to a community leader can be difficult to prove as state-sponsored. This means that MI5 and its partners must use a combination of intelligence, legal powers, and partnerships with the private sector to act early. It also means that the public rarely sees the full picture, which can lead to a false sense of security or, conversely, to anxiety about threats that seem invisible and unsolvable.
McCallum has called for a broader national effort, involving not only security agencies but also businesses, tech companies, academic institutions, and local authorities. This is a reflection of how hybrid warfare turns every vulnerable system into a potential target. Banks can be used to launder money for hostile states; social media platforms can amplify disinformation; supply chains can be disrupted by sabotage; public utilities can be targeted by cyberattacks. Defending against these threats requires a level of coordination that does not happen naturally, and the intelligence services cannot do it alone.
Building National Resilience Against Hybrid Threats
The phrase “hybrid campaign” can feel abstract, but its consequences are very real. When a Jewish school is threatened, when a cyberattack shuts down a hospital, when false stories inflame social division, the damage is felt in the lives of ordinary people. McCallum’s message was not just a warning; it was an invitation to rethink how Britain protects itself. National security is no longer the exclusive domain of spies and soldiers. It involves every citizen who spots something suspicious, every tech company that designs security into its products, every local leader who fosters community cohesion. Resilience, in this sense, is not a static quality; it is a muscle that must be exercised constantly.
There are difficult questions about how far the state should go in monitoring and intervening to prevent hybrid attacks. Granting sweeping new powers to the security services would carry its own risks, and McCallum was careful not to demand legislative changes. Instead, he emphasised partnership and vigilance. He noted that adversarial states are exploiting the very freedoms that make British society open, welcoming, and diverse. The challenge is to respond without adopting the authoritarian methods of the opponents, and to preserve democratic values while defending against those who wish to destroy them.
For Jewish communities specifically, the need for resilience has become a daily reality. Many have invested in physical security, training, and support networks. But no community should have to withstand such campaigns alone. The government has pledged support, and McCallum’s public comments are a signal that intelligence agencies are prioritising this issue. The broader public, too, has a role to play: countering antisemitism and standing with targeted communities is not just a moral obligation, but a national security imperative. When one group is attacked, the social fabric weakens for everyone.
The Long Road Ahead: Vigilance, Partnerships and Democratic Strength
McCallum’s warning is not a moment of panic, but a moment of truth. The threat environment in Britain has changed profoundly. The state-sponsored campaigns orchestrated by Tehran and Moscow are not temporary tactics; they are long-term strategies designed to wear down democratic societies over time. There will be more plots, more attacks, more attempts at sabotage and subversion. The question is how Britain will respond. If the country can remain resilient, adaptable, and committed to its values, it has a strong chance of defeating these campaigns. But if it becomes complacent, divided, or hostile to the very institutions that protect it, the adversaries will gain ground.
The security agencies have demonstrated, time and again, that they can foil specific plots. But hybrid warfare is not a series of discrete incidents; it is a continuous, grinding contest. That means the strategy must be continuous, too. Intelligence sharing with allies, investment in cyber defences, public education, and a robust legal framework will all be essential. Strengthening community cohesion and challenging hatred are not merely social goals; they are defence strategies.
In the end, McCallum’s words should be taken as both a warning and a call to action. Britain’s security services are awake, capable, and attentive. But they cannot succeed alone. The public’s trust, cooperation, and understanding are essential. And while the threats from Tehran and Moscow are serious, they are not unbeatable. The challenge is to confront them with clear eyes, steady nerves, and a firm commitment to the democratic principles that make Britain worth targeting in the first place. As the country moves forward, the lesson of this moment is simple: security is shared, and resilience is built together.
