The outcome of this case may have left the UK with little legal recourse to reclaim control of Iran's oil fields. The United States and UK then began an oil boycott against Iran as a means of isolating it economically. Following this, the UK's intelligence service, MI6 requested assistance from the United States' newly-formed Central Intelligence Agency (CIA) to overthrow Mosaddeq. What followed was a series of disruptions and eventually Mosaddeq was overthrown in a coup in August 1953. Mohammad Reza Shah returned to Iran and solidified his authority backed by the U.S.