Underrättelsekällor: General bakom giftdåd i Salisbury kopplas till Prigozjins död

The Poisoning of Sergei and Yulia Skripal also known as the Salisbury Poisonings was a botched assassination attempt to poison Sergei Skripal, a former Russian military officer and double agent for the British intelligence agencies in the city of Salisbury, England on 4 March 2018. Sergei and his daughter, Yulia Skripal, were poisoned by means of a Novichok nerve agent. Both spent several weeks in hospital in a critical condition, before being discharged. A police officer, Nick Bailey, was also taken into intensive care after attending the incident, and was later discharged.The British government accused Russia of attempted murder and announced a series of punitive measures against Russia, including the expulsion of diplomats. The UK's official assessment of the incident was supported by 28 other countries which responded similarly. Altogether, an unprecedented 153 Russian diplomats were expelled by the end of March 2018. Russia denied the accusations, expelled foreign diplomats in retaliation for the expulsion of its own diplomats, and accused Britain of the poisoning.On 30 June 2018, a similar poisoning of two British nationals in Amesbury, seven miles (11 km) north of Salisbury, involved the same nerve agent. Charlie Rowley found a perfume bottle, later discovered to contain the agent, in a litter bin somewhere in Salisbury and gave it to Dawn Sturgess who sprayed it on her wrist. Sturgess fell ill within 15 minutes and died on 8 July, but Rowley, who also came into contact with the poison, survived. British police believe this incident was not a targeted attack, but a result of the way the nerve agent was disposed of after the poisoning in Salisbury. A public inquiry was launched into the circumstances of Sturgess's death.On 5 September 2018, British authorities identified two Russian nationals, using the names Alexander Petrov and Ruslan Boshirov, as suspected of the Skripals' poisoning, and alleged that they were active officers in Russian military intelligence. Later, investigative website Bellingcat stated that it had positively identified Ruslan Boshirov as being the highly decorated GRU Colonel Anatoliy Chepiga, that Alexander Petrov was Alexander Mishkin, also of the GRU, and that a third GRU officer present in the UK at the time was identified as Denis Vyacheslavovich Sergeev, believed to hold the rank of major general in the GRU. The pattern of his communications while in the UK indicates that he liaised with superior officers in Moscow. The attempted assassination and subsequent agent exposures was an embarrassment for Putin and for Russia's spying organisation. It was allegedly organised by a secret Unit 29155 of the Russian GRU under command of Major General Andrei V. Averyanov. On 27 November 2019, the OPCW added Novichok, the Soviet-era nerve agent used in the attack, to its list of banned substances.

Unit 29155 is a Russian (GRU) unit tasked with foreign assassinations and other activities aimed at destabilizing European countries. The unit is thought to have operated in secret since at least 2008, though its existence only became publicly known in 2019.