The European Union agrees with the United Kingdom's assessment of the incident, stating that "there is no plausible alternative explanation" to Russian involvement.
The foreign ministers of Germany, Russia, the United Kingdom, France, China and Iran agree to the creation of a Special Purpose Vehicle, a financial facility in the European Union, to facilitate payments and continue trade with Iran after the US withdrawal from the Iran deal.
Vasily Nebenzia, the Russian ambassador to the United Nations, tells the UN Security Council the United Kingdom has created a "fake story" and says Russia has "told our British colleagues that you are playing with fire and you will be sorry." UK representative to UN Karen Pierce tells the Security Council UK actions "stand up to any scrutiny" and compares Russian requests to join the investigation to an arsonist investigating their own fire.
The death of Russian businessman Nikolai Glushkov, who lived in exile in the United Kingdom, is confirmed by a coroner's examination to be a murder. The killing happened eight days after the poisoning of Sergei and Yulia Skripal.
Former Secret Intelligence Service (MI6) spy Sergei Skripal and his daughter are taken to a hospital in critical condition after being exposed to an unknown substance in Wiltshire, United Kingdom. Skripal was granted refugee status in the UK following a "spy swap" deal between the UK and Russia in 2010.
Iran, the United States, the United Kingdom, France, Russia, People's Republic of China, Germany, and the European Union (the P5+1) reach a breakthrough agreement on the general framework for an agreement on Iran's nuclear program, but sign no verbal agreement or official document. The deadline for a full deal is June 30, 2015.