Skripal 'regretted being double agent'

A former classmate says the spy told him he wrote to Vladimir Putin asking to come back to Russia.

Sergei Skripal and his daughter Yulia are in a critical condition after being poisoned by a nerve agent in Salisbury on 4 March.

Vladimir Timoshkov was speaking exclusively to the BBC.

Video produced by Abdujalil Abdurasulov and Elizaveta Vereykina.

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