This will be Metreweli first-ever speech after she became the first female head of the Secret Intelligence Service 116-year history, a role publicly known by the codename C.

UK spy agency's WARNING: MI6 chief says Russia poses 'aggressive, expansionist, and revisionist' threat. Details inside

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UK spy agency's WARNING: MI6 chief says Russia poses 'aggressive, expansionist, and revisionist' threat. Details inside