US-Iran relations: A guide to 60 years of tricky relations
18 June 2014 Last updated at 17:25 BST
US-Iran relations have been in the spotlight once again as the Iraq crisis has unfolded this week.
From the CIA-orchestrated overthrow of Iran's prime minister in 1953 to a phone call between Presidents Obama and Rouhani and possible direct talks on Iraq's security,
BBC News looks at more than 60 years of tricky relations between Iran and the US.