UK MI6 Chief Warns of ‘Aggressive’ Russia Threat in First Public Speech

December 15, 2025

Metreweli will also emphasize the need for MI6 to deepen its use of technology to counter modern threats, including terrorism, cyber operations and information warfare.
Ukrainian soldiers of 63rd brigade are seen at an artillery position of an American M777 howitzer in the direction of Kreminna as Russia-Ukraine war continues in Ukraine on April 06, 2024. Photo by Anadolu Images.

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he head of Britain’s foreign intelligence service MI6 will warn on Monday that Russia poses an “aggressive, expansionist and revisionist” threat to international security, in her first public speech since taking office.

Blaise Metreweli, who became MI6 chief in October and is the first woman to lead the agency in its 116-year history, will say President Vladimir Putin should be in no doubt that Western support for Ukraine remains firm and long-term.

“Putin should be in no doubt — our support is enduring,” Metreweli will say, according to advance extracts of her remarks. “The pressure we apply on Ukraine’s behalf will be sustained.”

She will warn that Moscow deliberately fuels instability abroad, describing Russia’s actions as a deliberate strategy rather than a by-product of foreign policy.

“The export of chaos is a feature, not a bug, in the Russian approach to international engagement,” she will say, adding that such behavior is likely to continue unless Putin is forced to “change his calculus.”

UK maintains sanctions pressure

Britain has imposed sweeping sanctions on Russian business figures, political leaders, companies and vessels since Russia’s full-scale invasion of Ukraine in 2022. London has also sanctioned Russia’s military intelligence agency, the GRU, in its entirety.

Metreweli’s remarks come as diplomatic efforts to halt the conflict continue. Over the weekend, Germany hosted talks involving U.S. and Ukrainian officials on a possible ceasefire, ahead of a summit in Berlin on Monday that will include European leaders.

Metreweli will also emphasize the need for MI6 to deepen its use of technology to counter modern threats, including terrorism, cyber operations and information warfare.

“Mastery of technology must infuse everything we do,” she will say. “We must be as comfortable with lines of code as we are with human sources — as fluent in Python as we are in multiple languages.”

She will argue that technological expertise must extend beyond research labs into frontline intelligence operations and organizational culture.

Broader security warnings

In a separate speech on Monday, Richard Knighton, head of Britain’s armed forces, is expected to call for a “whole society” approach to defence amid growing global instability. He will warn of an increased probability of Russia attempting to invade a NATO member state, underscoring the seriousness of the threat facing Europe.

Metreweli’s address marks a rare public intervention by the MI6 chief and signals a sharpened warning from Britain’s intelligence leadership as tensions with Moscow persist.

(Source: Reuters)

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