Steele 's expertise on Russia remained valued , and he served as a senior officer under John Scarlett , Chief of the Secret Intelligence Service ( MI6 ) , from 2004 to 2009 . Steele was selected as case officer for Alexander Litvinenko and participated in the investigation of the Litvinenko poisoning in 2006 . It was Steele who quickly realised that Litvinenko 's death " was a Russian state ' hit . Twelve years later he allegedly was included himself into a hit list of the Russian Federal Security Service , along with Sergei Skripal who was poisoned in 2018 by a binary chemical weapon Novichok in Britain
poisoned in 2018
Poisoning of Sergei and Yulia Skripal
Christopher Steele