The CIA has for the first time acknowledged that the 1953 coup it backed in Iran that overthrew its prime minister and cemented the rule of Shah Mohammad Reza Pahlavi was undemocratic. The CIA in 2013 admitted its role in the coup that brought down Iran's then prime minister, Mohammad Mosaddeq, but until now has not publicly acknowledged that the move was undemocratic. Much of the agency's official history of the coup remains classified, complicating the public's understanding of an event that still resonates, as tensions remain high between Tehran and Washington. Iran's mission to the United Nations described the 1953 coup as marking "the inception of relentless American meddling in Iran's internal affairs" and dismissed the US acknowledgments. "The US admission never translated into compensatory action or a genuine commitment to refrain from future interference, nor did it change its subversive policy towards the Islamic Republic of Iran," the mission said in a statement. Seven decades later, the 1953 coup remains as hotly debated as ever in Iran, where many see a straight line leading from the coup to the 1979 Islamic Revolution that ultimately toppled the shah. The coup also prompted the CIA into a series of further actions in other countries, including Guatemala, where US clandestine operations in 1954 installed a military dictator and sparked a 40-year civil war that likely killed approximately 245,000 people.