What is Five Eyes? The Nine and Fourteen Eyes explained

What is the Five Eyes alliance, and who are the Nine Eyes and Fourteen Eyes? The questions resurface whenever an espionage story crosses borders. Five Eyes is the informal name for signals intelligence (SIGINT) cooperation between the United States, the United Kingdom, Canada, Australia and New Zealand. Born at the end of the Second World War, it is widely regarded as the closest and longest-lasting intelligence partnership in the world.

The Nine and Fourteen Eyes, by contrast, are not formal treaties under those names. They are press labels for wider circles of European partners, known mainly through documents leaked in 2013. This guide covers the alliance's origins, structure, controversies and present role, separating what is officially confirmed from what comes from leaks or speculation.

Five Eyes at a glance

• Members: United States, United Kingdom, Canada, Australia and New Zealand.
• SIGINT agencies: NSA (US), GCHQ (UK), CSE (Canada), ASD (Australia) and GCSB (New Zealand).
• Legal basis: the UKUSA Agreement, signed in 1946 by Britain and the US and later extended; its early texts were declassified in 2010.
• Where the name comes from: the classification marking 'AUS/CAN/NZ/UK/US EYES ONLY', used for material only those five countries could see.
• Scope today: beyond SIGINT, cooperation extends to security services, defence, law enforcement and oversight bodies through parallel forums.

From Bletchley Park to UKUSA, 1940–1956

The alliance was born of necessity. In February 1941, before the United States had even entered the war, a team of American codebreakers led by Abraham Sinkov travelled to Bletchley Park to swap expertise with the British. In May 1943 the BRUSA Agreement formalised cooperation on breaking enemy communications — the world of Enigma and Japanese codes.

After the war, the Soviet threat made the partnership permanent. On 5 March 1946 the British–US Communication Intelligence Agreement, known as UKUSA, was signed. Canada joined in 1948, Australia and New Zealand in 1956. For decades governments would not even acknowledge it existed. In June 2010 the NSA and the UK National Archives released the original texts and papers from its early years.

Three circles: Five, Nine and Fourteen Eyes

The image of concentric circles is helpful, if simplified. In NSA terminology revealed by the Snowden documents, the four Anglo partners are 'Second Parties' with the highest level of trust, while others are 'Third Parties' with narrower bilateral agreements and their own multilateral forums.

SIGINT Seniors Europe: the real name of the 14 Eyes

In December 2013 Swedish public broadcaster SVT published excerpts of NSA documents naming the agencies of nine European countries as Third Parties and giving the fourteen-nation group its name: SIGINT Seniors Europe, or SSEUR. A 2010 internal NSA newsletter, also published, described its annual conference in Berlin, hosted by Germany's BND and focused on Afghanistan, counter-terrorism, piracy and network defence. Analyses of the documents date the group to the early 1980s, initially to share military intelligence on the Soviet bloc. A Pacific counterpart, SIGINT Seniors Pacific, also exists.

Where Spain and other partners fit

Spain's intelligence service appears in those documents as an NSA Third Party and SSEUR member. That does not make Spain part of Five Eyes or give it the same access. The best-known episode came in October 2013, when Spanish daily El Mundo reported that the NSA had logged metadata on more than 60 million calls in Spain in a single month. Shortly afterwards NSA director Keith Alexander told Congress that such data had been collected by European services and shared with the US. The precise reading of those documents remained disputed.

Maximator: Europe's hidden alliance

Signals alliances are not just an Anglo affair. In 2020 Professor Bart Jacobs of Radboud University revealed in Intelligence and National Security the existence of Maximator, a secret SIGINT alliance of Denmark, Sweden, Germany, the Netherlands and France dating back to the late 1970s. According to his research, its members benefited from information on rigged cipher machines that Germany obtained through its joint control, with the CIA, of the Swiss firm Crypto AG.

How the cooperation works

The public record suggests a division of labour rather than a joint agency. Each service keeps its own sovereignty and laws, but the alliance rests on sharing intelligence products, methods and, in part, infrastructure.

• Geographic division: each partner has traditionally covered certain regions — Australia and New Zealand, for instance, are associated with the South Pacific and Asia.
• Sharing by default: among the five, sharing is the norm with exceptions — unusual in the intelligence world.
• Common standards: compatible procedures, classification and training make joint work easier.
• Parallel forums: the Five Country Ministerial brings together interior and justice ministers, and the Five Eyes Intelligence Oversight and Review Council, set up in 2016, links the watchdogs.

A 'no-spy' understanding between partners is often described. It has never been acknowledged as absolute, and documents leaked in 2013 pointed to exceptions and to arrangements for sharing data on other members' citizens. Caution is warranted: the public record is fragmentary.

Known sites on the public map

Some facilities have been known for decades because their antennas and radomes are visible or have been debated in parliament or targeted by protesters. Their specific functions remain secret; what follows is limited to what is acknowledged or widely documented.

• Menwith Hill (England): an RAF station largely operated by the NSA, with dozens of radomes.
• Pine Gap (Australia): a joint Australian–US facility near Alice Springs, operating since 1970.
• Waihopai (New Zealand): a GCSB station whose satellite dishes, built in 1989 and 1998, were removed in 2022; the GCSB said they produced less than 0.5% of its reports.
• GCHQ Bude (England): a British satellite-interception station in Cornwall.

Waihopai illustrates a deeper shift: as communications moved from satellites to fibre-optic cables and the internet, interception followed them to the cables and to the big service providers.

From ECHELON to Snowden

ECHELON and economic espionage

In the late 1990s, New Zealand journalist Nicky Hager's book Secret Power (1996) and Duncan Campbell's reports for the European Parliament popularised the name ECHELON for the Five Eyes satellite-interception network. In 2001 a temporary European Parliament committee concluded that the existence of a global interception system run by the UKUSA states was no longer in doubt, although it could not conclusively prove systematic use for industrial espionage.

The 2013 disclosures

In June 2013 Edward Snowden handed journalists thousands of NSA documents. The most widely reported described programmes such as PRISM, for access to data held by major tech companies; GCHQ's Tempora, on tapping undersea cables; XKeyscore, a system for searching vast datasets; and MUSCULAR, linked to the connections between Google and Yahoo data centres. Reports also revealed that the NSA had monitored German Chancellor Angela Merkel's phone and that GCHQ had penetrated Belgian telecoms operator Belgacom. For the full story, see our article on the Snowden case.

The legal debate: sovereignty, privacy and oversight

Criticism of Five Eyes boils down to one question: if each partner receives material collected by another, can national limits on spying on one's own citizens be sidestepped? Governments deny it and insist all exchanges comply with each country's law. European courts have weighed in.

• European Court of Human Rights, Big Brother Watch and Others v. United Kingdom (Grand Chamber, 25 May 2021): bulk interception is not incompatible with the Convention as such, but the UK regime at the time breached the right to privacy for lack of adequate safeguards.
• Court of Justice of the EU, Schrems II (16 July 2020): struck down the EU–US Privacy Shield because safeguards against US surveillance were deemed insufficient.
• Parliamentary oversight: each country has intelligence committees, but their visibility into what is shared with allies is limited — a recurring criticism from scholars and civil-liberties groups.

Five Eyes today

Far from fading, the alliance has become more visible. In October 2023 the heads of the FBI, MI5, Australia's ASIO, Canada's CSIS and New Zealand's NZSIS appeared together in public for the first time, in California, to warn about espionage and technology theft attributed to China. In February 2024 agencies from all five countries co-signed an advisory on the Volt Typhoon group and its presence in critical infrastructure.

• Indo-Pacific: competition with China is now the shared priority. AUKUS, the 2021 pact between Australia, the UK and the US, is a separate agreement focused on defence and technology.
• Ukraine: before the 2022 invasion, Washington and London publicly declassified some of their intelligence — an unusual strategy of pre-emptive disclosure.
• Internal strains: in 2023 the US ambassador to Canada confirmed there had been 'shared intelligence among Five Eyes partners' in the case of the killing of Sikh leader Hardeep Singh Nijjar, which Canada linked to agents of the Indian government.
• Expansion: closer cooperation with Japan is often discussed, without implying formal membership.

What we know — and what we don't