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
Tip It On Back premiered in September 2012. It was filmed at the Georgia Theatre in Athens, Georgia. "Tip It on Back" debuted at number 50 on the U.S. "Billboard" Hot Country Songs chart for the week of September 1, 2012. It also debuted at number 99 on the U.S. "Billboard" Hot 100 chart for the week of November 17, 2012. Tip It On Back "Tip It on Back" is a song written by Ross Copperman, Jon Nite, and Tully Kennedy and recorded by American country music artist Dierks Bentley. It was released in August 2012 as the fourth and final single from Bentley's