Who is the Salisbury spy Sergei Skripal?

Former Russian double agent Sergei Skripal is in a critical condition in hospital after an apparent poisoning in Salisbury. He and his daughter were found unconscious on a bench on Sunday. She is also critically ill. The incident has drawn comparisons with the case of Alexander Litvinenko, who was killed with polonium by two Russian men • Woman in Russian spy mystery is Sergei Skripal’s daughter View the video at