Before they were sworn enemies, Iran and the United States were close allies. So how did decades of cooperation descend into revolution, hostage crises, secret arms deals and nuclear brinkmanship? Fionnán Sheahan is joined by Professor Scott Lucas to trace the long and volatile history between Washington and Tehran and to ask what happens next as tensions rise once more. We want to earn your trust and are members of the Trust Project. See our ethics policies at independent.ie/ourjournalism. See omnystudio.com/listener for privacy information.