Iran called on France on Thursday to adopt a more diplomatic tone to ease international tensions over the country's disputed nuclear programme. French Foreign Minister Philippe Douste-Blazy said on Thursday Iran was pursuing a clandestine military nuclear programme. "I suggest Mr. Douste-Blazy to use a diplomatic tone and avoid increasing the tension (over Iran's nuclear programme) by making such comments," Iran's chief nuclear negotiator Ali Larijani told state television. "His motivation for making such comments is unclear to us. But adopting a logical stance towards Iran's nuclear activity, better serves the interest of the region."