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
London Waterloo station all official documentation. It has the station code WAT. It is in the London Borough of Lambeth on the south bank of the River Thames, close to Waterloo Bridge and northeast of Westminster Bridge. The main entrance is to the south of the junction of Waterloo Road and York Road. It is named after the eponymous bridge, which itself was named after the Battle of Waterloo, a battle that occurred exactly two years prior to the opening ceremony for the bridge. Several London bus routes, including 1, 4, 26, 59, 68, 171, 176, 188, 507, 521 and RV1 all stop