Getting this far has been a process that has taken over a decade, as Channel 4 News International Editor Lindsey Hilsum explains.
Iran nuclear timeline
2003 Mohammed Khatami, a reformer, is Iranian PM. Negotiations on the country’s nuclear programme begin. (Jack Straw, British FM, takes a lead role. His chief negotiatior is John Sawers, later head of MI6)
2005 Hardliner Mahmoud Ahmadinejad is elected President
2006 Iran announces that it has enriched uranium for the first time
2007 UNSC 1747 imposes sanctions against Iran for nuclear programme
2008 UNSC 1803 imposes further sanctions
2009 Rigged elections return hardliner Mahmoud Ahmadinejad to power. Vast protests are quashed. Western intelligence services uncover Fordow, a secret enrichment facility dug into the mountains near Qom.