Ukraine was sea-change for openness – GCHQ head

The Ukraine conflict marked a sea-change for the release of intelligence, the head of the spy agency GCHQ Sir Jeremy Fleming has said.

Washington and London took the unusual step of publicising their knowledge of Russia's plans ahead of its invasion.

The head of US intelligence, Avril Haines, said lessons had been learned including the limits of such moves to publicise intelligence.

Sir Jeremy interviewed her for Radio 4's Today programme.