Denis Vyacheslavovich Sergeev, in Europe alias Sergej Fedotov (born 1973 in Usharal, Kazakhstan) is a Russian officer of military intelligence service GRU.
[4] One of the aliases of Sergeev, "Sergei Fedotov", was on a Russian passport used in Bulgaria at the time of the Novichok poisoning of Emil Gebrev, a Sofia arms dealer.
[1] The Bulgarian Prosecutor General's Office has confirmed the presence of Sergeev during the period of the attack but the investigation was shuttered by July 2019 amid Gebrev's claims of cowardice.
[7] In February 2019, Bellingcat confirmed that a third Russian GRU officer was present in the United Kingdom when the Skripals' were poisoned by Novichok in March 2018.
Furthermore, Bellingcat established that "Russian authorities have taken the unusual measure of erasing any public records" of Sergeev's existence, as well as the other two main suspects in the Skripal poisoning.