READ MORE: UK Intelligence: Novichok Was Planted in Luggage of Skripal's Daughter - Reports

Following the attack, UK Prime Minister Theresa May on Monday said Russia was "highly likely" responsible for it and announced that 23 Russian diplomats "identified as undeclared intelligence officers" would be expelled and given one week to leave. Britain’s foreign secretary accused Russian President Vladimir Putin of personally ordering the poisoning of the Skripals, who remain hospitalized in critical condition after the March 4 attack. Image copyright Facebook Image caption Russian businessman Nikolai Glushkov was found dead at his home on March 12

UK police have launched a murder investigation after the death of Russian businessman Nikolai Glushkov in south-west London. Meanwhile, Russia's investigative committee has said it has opened a criminal case investigation into "the murder" of Mr Glushkov and the "attempted murder" of Yulia Skripal. She tells British lawmakers that the military-grade nerve agent used was identified as belonging to a group of nerve agents known as Novichok and of a type developed by Russia. On March 12 British Prime Minister Theresa May says it is "highly likely that Russia was responsible for the act", saying Moscow could be directly to blame or may have "lost control" of the nerve agent.
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.