The post-revolutionary government of Iran has regarded the United States and the United Kingdom as imperialist states, who have a long history of interfering in Iran's internal affairs. In 1907, an Anglo-Russian agreement between Russia and Britain divided Iran into spheres of influence, ignoring, although not terminating, Iran's sovereignty. In 1953, during the Cold War, British intelligence officials[2] and the administration of the U.S. President Dwight D. Eisenhower planned a joint Anglo-American operation to overthrow the elected prime minister, Mohammad Mossadeq.[3][4][5] The Eisenhower administration was concerned that Mossadeq's nationalist aspirations could lead to an eventual communist takeover of Iran.[6][7][8][9][10][11] The operation was code-named Operation Ajax.