Britain’s domestic intelligence chief has warned that the country has entered a “new era of national security,” with state-backed threats becoming a central concern alongside terrorism.
MI5 Director General Ken McCallum said the service is dealing with a more hostile international environment involving Russia, Iran and other actors. He described a shift in the agency’s mission as it works not only to investigate threats but also to protect essential national systems from disruption. Publicly identified areas of concern include banking, aviation, healthcare, military facilities and other critical infrastructure.
The warning followed reports that Iran may be targeting military sites in Britain and that a suspected plot involving RAF Fairford was not an isolated incident. The claims remain part of an intelligence and law-enforcement assessment rather than a public finding that every alleged operation has been proven in court. Authorities have nevertheless treated hostile-state activity as a growing national-security challenge.
McCallum also highlighted the role of artificial intelligence. Intelligence agencies are assessing how AI could increase the capability of terrorists and hostile states, including through automated influence operations, cyber activity and the development of harmful biological knowledge. The concern is not limited to sophisticated military systems. AI tools can lower the cost of producing convincing disinformation, impersonating officials and targeting vulnerable communities.
For companies, the implications extend well beyond traditional security contractors. Banks, airlines, hospitals, cloud providers, telecommunications operators and logistics companies may face greater expectations to detect hostile activity, protect networks and maintain continuity during attacks. Governments are likely to intensify information-sharing requirements and scrutinize supply chains that connect critical services to foreign technology or infrastructure.
MI5 said it has launched an AI Threat Assessment Centre and expanded cooperation with other British agencies and Five Eyes partners. The institutional response reflects a broader shift from treating security as a specialized government function to treating it as a resilience issue shared by public authorities and private operators.
The warning also carries diplomatic significance. Britain must balance economic relationships, including trade and investment ties with China and other major powers, against pressure to protect sensitive technology and democratic institutions. A more adversarial security environment can raise compliance costs and complicate cross-border business.
The central message is that national security is increasingly inseparable from economic and digital security. Disruption to one system can rapidly spread across markets, public services and public confidence.
Sources: - https://apnews.com/article/a8a03a2dbac09648fa4c56f728fa09ac - https://www.mi5.gov.uk/news-categories/state-threats