Prime Minister Theresa May was directly deceiving the deputies, while talking about the Russian poisonous substance “Novichok”. Deceiving, because there has never been such a poisonous substance in the world and never was: there has never been a project to develop this substance neither in the USSR nor in Russia. […] It turns out that May invented herself such a substance – ‘Novichok’.
Many competing and contradictory stories promulgated by Russian state-controlled media, the only connecting thread being to confuse their audience and exclude any possibility of Russian involvement. https://euvsdisinfo.eu/disinformation-cases/?text=sergei+skripal&disinfo_issue=&date=
The nerve agent has been identified as Novichok (which means newcomer in Russian). It is series of nerve agents and is known to be more powerful than VX and was developed in Russia in the 1970s and 1980s. https://www.voanews.com/a/british-prime-minister-russia-poisoning-spy/4294683.html It's so unusual, that very few scientists outside of Russia have any real experience in dealing with it and no country outside of Russia is known to have developed the substance. https://edition.cnn.com/2018/03/13/europe/what-is-novichok-nerve-agent-intl/index.html, https://theconversation.com/what-we-know-about-novichok-the-newby-nerve-agents-linked-to-russia-93264
In its statement, the European Union expressed shock at the offensive use of any military-grade nerve agent, of a type developed by Russia, for the first time on European soil in over 70 years. http://www.consilium.europa.eu/en/press/press-releases/2018/03/19/statement-by-the-foreign-affairs-council-on-the-salisbury-attack/