Bulgaria–United States relations to work. Bulgaria became a member of the Warsaw Pact on May 14, 1955. Though no Soviet troops were stationed on Bulgarian soil, in 1968, Zhivkov sent a Bulgarian division to join Polish, Hungarian and Soviet troops to crush a popular uprising in Prague. In 1978, the Bulgarian secret police were implicated in the assassination in London of Georgi Markov, a Bulgarian dissident who was a correspondent for the BBC World Service, Deutsche Welle radio and the U.S. sponsored Radio Free Europe. Markov was assassinated with a poisoned umbrella on September 7, Zhivkov's birthday. The rise of democratic movements across
Death of a Dissident Death of a Dissident Death of a Dissident: The Poisoning of Alexander Litvinenko and the Return of the KGB is a book written by Alexander Goldfarb and Marina Litvinenko about the life and death of her husband, former FSB officer Alexander Litvinenko who was poisoned by the radioactive element polonium in London in November 2006. The life of Alexander Litvinenko has been described in the book at the background of power struggle between different political forces in post-Soviet Russia. The book presents active measures which, according to authors, have been undertaken by Russian state-security services to bring FSB leaders to