With peace talks between the US and Iran at an impasse, the Pentagon says it is planning a short, sharp campaign to force Iran's hand in negotiations. Could the focus be a seizure of Iran's enriched uranium, and how would it be carried out? The Security Brief takes you back to 1994, when Project Sapphire saw the US conduct a covert operation in Kazakhstan to seize 600kg of enriched uranium, before smuggling it back to the United States. Christian Fraser and Mikey Kay explain what can be learned