Sergei Skripal is a former Russian military officer and British spy who acted as a double agent for the UK's intelligence services during the 1990's and early 2000's, until his arrest in December 2004. On March 4, 2018, he and his daughter Yulia Skripal were poisoned in Salisbury, England, with a Novichok nerve agent, according to official UK sources.[3][4] After three weeks in critical condition, Yulia regained consciousness and was able to speak.[5] Sergei was also in a critical condition until he regained consciousness one month after the attack.