US Secretary of State Condoleezza Rice addresses the media at a Women Leaders conference for Peace and Security in the Middle East in Vienna, 31 May 2007. Rice told Iran to change tactics and freeze uranium enrichment, but Tehran remained defiant ahead of talks on its nuclear programme with the European Union.
Iran covets nuclear weapons and will not voluntarily halt uranium enrichment.
The Natanz uranium enrichment complex in Natanz is pictured in this January 2, 2006 satellite image.
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