The lengthy operation reportedly failed to yield any proof, and the suspected double agent eventually quit the agency

British intelligence agencies spent two decades hunting a suspected Russian double agent inside MI6, only to drop the case after failing to find evidence, The Guardian has reported, citing unnamed sources. The investigation, dubbed Operation Wedlock, was eventually closed as “inconclusive,” and the suspect left service, the outlet said on Friday.

The probe, which reportedly ran from the mid-1990s to around 2015, was led by MI5, the UK’s domestic counter-intelligence agency. MI6, which is responsible for foreign intelligence…

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