The Guardian

UK and US given case file on 'nerve agent made in Russian lab'

Exclusive: Papers may shed light on Russia’s production of chemical used in Salisbury spy poisoning
395631 01: The gates surrounding the Shikhany research center near the town of Saratov on the Volga river in Russia in an undated photo. The settlement which consists of the bases of Shikhany I and Shikhany II are a military complex and a civil research institute on organic synthesis technology. The Shikhany institute was established in 1926 and has gradually become one of the most important sites for researching chemical and biological weapons. (Photo by East News/Getty Images) (AMERICAS SALES ONLY) / Wojtek Laski / Getty Images

British and American authorities have been given several chemical analyses of a substance believed to be a novichok nerve agent produced in Russia’s closed Shikhany military facility, a Russian lawyer has told the Guardian.

Boris Kuznetsov, who fled Russia in 2007, said he had handed British diplomats the police case files from the 1995 murder of a Russian banker and his secretary with a toxic substance, which scientists have identified as a product of the Soviet-designed Foliant programme.

A was used in the Salisbury poisoning last month.

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