France's President Francois Hollande urged Iran on Wednesday to "provide answers and not provocations" over its disputed nuclear programme, after the country's supreme leader Ayatollah Ali Khamenei vowed there would be no retreat from "red lines". "It is clear that Khamenei's proposal's could not lead to calm and understanding. Iran must provide answers and not provocations," Hollande said during a press conference at the close of a Franco-Italian summit in Rome.