Sergei Skripal

Sergei Viktorovich Skripal (Russian: Сергей Викторович Скрипаль, pronounced [sʲɪrˈɡʲej ˈvʲiktərəvʲɪtɕ skrʲɪˈpalʲ]; born 23 June 1951) is a former Russian military intelligence officer who acted as a double agent for the United Kingdom's intelligence services during the 1990s and early 2000s. In December 2004, he was arrested by Russia's Federal Security Service (FSB) and later tried, convicted of high treason, and sentenced to 13 years in prison. He settled in the United Kingdom in 2010 following the Illegals Programme spy swap. He holds both Russian and British citizenship.

On 4 March 2018, he and his daughter Yulia, a Russian citizen who was visiting him from Moscow, were poisoned with a Russian-developed Novichok nerve agent, and were admitted to Salisbury District Hospital in a critical condition. The poisoning was investigated by the British intelligence service as an attempted murder.