Hillary Clinton, the US secretary of state, has said the world will "not wait indefinitely" for proof that Iran is not making nuclear weapons.<br /><br />But Iran has dismissed those comments, saying threats and deadlines will have no effect on Tehran.<br /><br />A foreign ministry spokesperson says Iran is committed to following international law, but that uranium enrichment remains a "non-negotiable" right.<br /><br />Al Jazeera's Nazanine Moshiri reports from Tehran.
