A-234 is an organophosphate nerve agent . It was developed in the Soviet Union under the Foliant program , and is one of the group of compounds referred to as Novichok agents , that were revealed by Vil Mirzayanov . In March 2018 , the Russian ambassador to the UK , Alexander Yakovenko , claimed to have been informed by British authorities that A-234 had been identified as the agent used in the poisoning of Sergei and Yulia Skripal . Vladimir Uglev , one of the inventors of the Novichok series of compounds , said he was " 99 per cent sure that it was A-234 " in relation to the 2018 Amesbury poisonings , noting its unusually high persistence in the environment
2018 Amesbury poisonings
2018 Amesbury poisonings
A-234 (nerve agent)