Key Takeaways
- MI6 was ranked the most powerful foreign intelligence service in Europe, scoring 251 points in a peer‑review survey of 60 professionals from 25 countries.
- France’s DGSE came second with 169 points, praised for its global reach and operational capability.
- The Netherlands, Ukraine and Germany rounded out the top five, while Slovakia’s service received the lowest rating.
- Reviewers highlighted MI6’s strength in recruiting high‑level informants and penetrating the elites of Russia, China, Iran and Turkey.
- British intelligence was the first to warn Ukraine of the likely Russian invasion in February 2022 and remains a steadfast ally of Kyiv.
- Former CIA officials affirmed that MI6 leads on the Ukraine file and possesses the strongest secret‑service apparatus in Europe.
- In 2023, Blaise Metreweli became the first woman to head MI6, succeeding Sir Richard Moore.
- A former DGSE chief noted that the British “play the long game,” investing in sources over a decade and employing “dirty tricks” when needed.
- The DGSE is renowned for counter‑terrorism expertise and clandestine operations aimed at eliminating threats to French security.
- A Polish intelligence executive described the DGSE as the only continental European service with near‑global reach, integrating technical collection, human intelligence and operational action.
Overview of the Ranking
The peer‑review conducted by the French magazine L’Express placed Britain’s Secret Intelligence Service, commonly known as MI6, at the top of a list evaluating foreign intelligence agencies in Europe. Sixty professionals representing intelligence services from twenty‑five allied nations were asked to rate their counterparts on criteria such as analytical depth, operational reach, source development, and technical sophistication. MI6 emerged with a commanding score of 251 points, a margin that clearly separated it from the next‑ranked services. The exercise aimed to provide an objective snapshot of how Western allied services perceive each other’s capabilities in an increasingly complex security environment.
Scoring Details and Methodology
Respondents were asked to allocate points based on perceived effectiveness across several domains, including human intelligence (HUMINT), signals intelligence (SIGINT), cyber capabilities, counter‑terrorism, and the ability to influence foreign policy outcomes. MI6 received particularly high marks for its expertise in recruiting high‑level informants and for its success in penetrating the ruling elites of adversarial states such as Russia, China, Iran, and Turkey. The review’s designers emphasized that the scores reflected collective professional judgment rather than any single metric, lending credibility to the outcome as a balanced assessment of comparative strength.
Comparative Performance of France and Others
France’s General Directorate for External Security (DGSE) secured the second position with 169 points. Reviewers commended the DGSE for its extensive global network, robust operational capability, and a reputation for decisive action in counter‑terrorism scenarios. The Netherlands, Ukraine, and Germany followed in third, fourth, and fifth places, respectively, each earning recognition for distinct strengths—whether the Dutch emphasis on technological innovation, Ukrainian resilience in the face of aggression, or German analytical rigor. At the opposite end of the spectrum, Slovakia’s intelligence service was rated the lowest, suggesting perceived gaps in resources, reach, or effectiveness relative to its peers.
Ukraine Warning and Alliance
A notable point highlighted in the review was MI6’s early warning to Ukraine regarding the imminent Russian invasion that began in February 2022. British intelligence allegedly shared actionable assessments with Kyiv well before the conflict erupted, enabling Ukrainian authorities to undertake preparatory measures. Since the outbreak of hostilities, the UK has maintained a steadfast alliance with Ukraine, providing military aid, intelligence sharing, and diplomatic support. This proactive stance reinforced the perception of MI6 as a forward‑looking service capable of anticipating and responding to major geopolitical shocks.
Expert Opinions from Former CIA Officials
Former CIA officials who contributed to the L’Express survey echoed the high regard for British intelligence. Ralph Goff, a former chief of operations for Europe and Eurasia at the CIA, remarked that “the British are in the lead on the Ukrainian file. We are right behind them.” Robert Gorelick, a former CIA station chief, added a more emphatic endorsement, stating that “the United Kingdom has by far the strongest secret services in Europe. MI6 is extraordinary.” Their testimonies underscored a transatlantic consensus that MI6’s combination of analytical depth, clandestine reach, and operational agility sets it apart from its European counterparts.
Leadership Change at MI6
The review also noted a historic milestone within MI6: in 2023, Blaise Metreweli became the first woman to assume the role of Chief of the Secret Intelligence Service, succeeding Sir Richard Moore. Her appointment marked a significant step toward greater gender diversity at the apex of British intelligence leadership. Observers suggested that her background in counter‑terrorism and cyber operations could further enhance MI6’s adaptability to emerging threats, while preserving the service’s traditional strengths in human source development and long‑term strategic penetration.
Perspectives from French DGSE Official
A former head of the DGSE offered insight into why the British service consistently outperforms its peers in certain domains. He observed that “the British have the ability to play the long game, investing in sources over a 10‑year horizon, somewhat like the Russians. And they have a taste for dirty tricks.” This comment alluded to MI6’s willingness to sustain clandestine relationships over extended periods, even when immediate payoff is uncertain, and to employ unconventional tactics when deemed necessary for national security. Such a patient, risk‑tolerant approach contrasts with services that prioritize short‑term, high‑visibility operations.
DGSE’s Counter‑Terrorism Reputation
Despite ranking second, the DGSE received particular praise for its counter‑terrorism expertise. The service is renowned for conducting clandestine operations aimed at “eliminating” individuals deemed threats to French security. Former French President François Hollande reportedly acknowledged authorizing at least forty such operations targeting high‑value figures in the Middle East and Africa, according to a 2017 publication. This track record of decisive, albeit controversial, action contributed to the DGSE’s high score in the counter‑terrorism category of the peer review.
Polish Intelligence View
A Polish intelligence executive summed up the broader European landscape by describing the DGSE as “the only service in continental Europe with near‑global reach.” He emphasized that the French agency effectively merges technical collection, human intelligence, and operational action capabilities into a cohesive whole. This integration enables the DGSE to conduct independent missions across multiple theaters, a capacity that few other European services can match. The comment highlighted the complementary nature of the top‑ranked services: while MI6 excels in long‑term source cultivation and penetrating elite networks, the DGSE stands out for its global operational footprint and rapid‑response capabilities.
Conclusion
The L’Express peer review paints a picture of European intelligence where MI6 holds a clear edge, chiefly due to its superior ability to develop and maintain high‑level sources over extended periods and to infiltrate the inner circles of adversarial regimes. France’s DGSE follows closely, distinguished by its worldwide reach and formidable counter‑terrorism posture. The remaining top‑five services—Netherlands, Ukraine, and Germany—each bring distinct strengths to the alliance, while lower‑ranked agencies such as Slovakia’s signal areas for potential improvement. Collectively, the assessment underscores the value of intra‑allied transparency and mutual learning, as nations seek to bolster their collective security in an era of renewed great‑power competition and hybrid threats. Continued dialogue, joint training, and shared best practices will likely be essential for maintaining the effectiveness of Europe’s intelligence architecture in the years ahead.