 He also added at a January 2006 conference in Tehran that a nation with "culture, logic and civilization" would not need nuclear weapons, and that countries that seek nuclear weapons are those that want to solve all problems by the use of force.In a 2008 interview Ahmadinejad elaborated that countries striving to obtain nuclear weapons are not politically progressive nations and those who possess them and continually make new generations of such bombs are "even more backward".In April 2006, Ahmadinejad announced that Iran had successfully refined uranium to a stage suitable for the nuclear fuel cycle.