Serguei Skripal was a GRU agent who was arrested in 2004. He was accused of collaborating with the British MI6 and sentenced for high treason until 2010, when he was exchanged for Russian agents arrested as part of the ‘Operation Illegal’. Since then, he had lived in the United Kingdom, apparently away from any “annoying” activity linked to his past as a member of the Service. However, in March 2018, he was found unconscious together with his daughter Yulia – she was visiting the United Kingdom – in a bank in Salisbury, allegedly the victim of an attack with Novichok, a Soviet nerve agent. The United Kingdom blames Russia for this attack without much detail.
At the end of June two Britons, a man and a woman, were admitted to the Salisbury District Hospital. An ambulance brought them from Amesbury, a few kilometres from where the former GRU agent and his daughter were poisoned. The investigation confirmed that they had also been poisoned with Novichok, apparently by accident: none of them had any previous connection with what happened in March and, possibly, they found by chance the nerve agent in what appeared to be a bottle of perfume abandoned in a park. The woman died in early July as a result of the effects of the poisoning.