Declassified: UK Knew NATO Expansion ‘Would Provoke’ Russia War.

Kit Klarenberg May 17

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May 17, 2026

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On April 15thDeclassified UK published a bombshell investigation exposing how in the mid-1990s, senior British political and military officials were well-aware NATO expansion into Central and Eastern Europe “would provoke [the] Russians,” and likely trigger all-out war. Hitherto unreported Ministry of Defence files reveal London knew Moscow’s “sensitivities” over a “hostile military alliance” enlarging up to its borders were profound, and based on very “real” concerns. Yet, NATO’s dangerous crusade to absorb Central and Eastern Europe continued apace, ultimately producing the Ukraine proxy conflict.

Since the so-called Special Military Operation’s February 2022 eruption, British officials have relentlessly reiterated the mantra the proxy war was “unprovoked”. However, a declassified March 1995 Foreign Office memo noted “there was a widespread psychological and intellectual perception in Moscow that NATO was a real threat.” In May that year, then-Prime Minister John Major succinctly articulated Russian anxieties to his Irish counterpart John Bruton, as a “fundamental fear…of encirclement.” Concerns about EU membership were comparatively muted:

“For the Russians, NATO had a much more threatening symbolism and political resonance…The Baltics were particularly difficult, with extreme sensitivity for Russia. It would be very hard to have a NATO border directly against Russia.”

Still, in 1997 NATO invited Czechia, Hungary, and Poland to join, which they did two years later. In 2004, Estonia, Latvia and Lithuania simultaneously joined the military alliance. So too did ex-Warsaw Pact members Bulgaria, Romania, Slovakia, and former Yugoslav republic Slovenia. Declassified UK shows how back in August 1996, British Defence Intelligence prepared a NATO enlargement study specifically forecasting that these countries joining could trigger war, and an alliance military operation launched via Article 5 of the NATO treaty in response.

This refers to collective self-defence, under which NATO members are obligated to come to each other’s defence if attacked. In the scenario, Defence Intelligence assumed “Russia has vehemently opposed NATO membership for the Baltic states and has threatened retaliation to preserve her own security against a perceived hostile military alliance on her borders.” In the real world, Boris Yeltsin made at-times irate public statements about NATO enlargement into the Baltics at the time, while lobbying US President Bill Clinton on the issue behind closed doors.

NATO expansion continued regardless. In December 1996, Declassified UK reports then-Russian premier Viktor Chernomyrdin privately warned Major: “Russia could not stop NATO enlarging, but this would create a fragile situation which could explode.” Other declassified files from this time show senior apparatchiks in London were acutely aware of Moscow’s “concern,” “fears,” “hostility,” “negative attitudes,” and “resentment” over alliance enlargement. Both Major and his successor Tony Blair explicitly pledged in person to Kremlin officials that NATO wouldn’t “move up to Russia’s borders.”

However, a secret September 1996 policy paper made clear Britain was committed “to enlarge NATO to the East,” even if “Russian acquiescence is not possible.” In February 1997, Russia’s deputy foreign minister Nikolai Afanasievsky angrily branded public discussions in Western capitals of admitting former Soviet republics to the alliance a “blatant provocation” in a meeting with Jeremy Greenstock, Britain’s ambassador to Moscow. Greenstock reassured his Russian opposite number NATO had “no intention” of admitting former Soviet states “at this stage” – which, technically, was true.

“Ukrainian entry into NATO is the brightest of all red-lines for the Russian elite (not just Putin). In my more than two and a half years of conversations with key Russian players, from knuckle-draggers in the dark recesses of the Kremlin to Putin’s sharpest liberal critics, I have yet to find anyone who views Ukraine in NATO as anything other than a direct challenge to Russian interests…a [membership] offer would be seen…as throwing down the strategic gauntlet…Russia will respond.”

Global Delinquents

Declassified: UK Knew NATO Expansion ‘Would Provoke’ Russia War

All my investigations are free to read, thanks to the enormous generosity of my readers. Independent journalism nonetheless requires investment, so if you value this article or any others, please consider sharing, or even becoming a paid subscriber. Your support is always gratefully received, and will never be forgotten. To buy me a coffee or two, please…

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Rootless cosmopolitan,down at heels intellectual;would be writer. 'Polemic is a discourse of conflict, whose effect depends on a delicate balance between the requirements of truth and the enticements of anger, the duty to argue and the zest to inflame. Its rhetoric allows, even enforces, a certain figurative licence. Like epitaphs in Johnson’s adage, it is not under oath.' https://www.lrb.co.uk/v15/n20/perry-anderson/diary
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