In London, Zakayev became friends with the Russian dissident and former FSB officer Alexander Litvinenko, later murdered by radioactive poisoning in November 2006; Zakayev accused the Russian President Putin of ordering the death of Litvinenko. In 2007, British police warned Zakayev that there was an increased threat to his personal security shortly before the alleged attempt to kill Berezovsky by the FSB-connected Chechen gangster Movladi Atlangeriyev (or "Mr A"). According to the KGB defector Oleg Gordievsky in 2008, Zakayev was placed #2 on the FSB assassination list, between Berezovsky and Litvinenko. In January 2008, Zakayev's name showed up on the purported hit list of Ramzan Kadyrov's enemies abroad to be killed, which was published on the Internet following the murder of the Chechen dissident Umar Israilov (a former bodyguard of Kadyrov who was shot dead after receiving asylum in Austria). Zakayev was arrested by the Polish police during his visit to Poland on 17 September 2010. He was released the same day.