 Complete the following phrase:  Steeles 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 a counterintelligence specialistref nameHarding_Sabbagh_1112019ref and 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 Litvinenkos death was a Russian state hit. Twelve years later Boris Karpichkov alleged that Steele himself was included in a hit list of the Russian Federal Security Service, along with Sergei Skripal who was 