Similarly, in December 2003, after hiding construction of the Natanz uranium-enrichment facility and other plants from the IAEA, Iran agreed to sign – but not ratify – the so-called Additional Protocol, allowing broader application of IAEA safeguards. Then, in November 2004, in negotiations with European representatives, Iran agreed to suspend nuclear enrichment.
类似地，2003年12月，在对IAEA隐藏了纳坦兹铀浓缩设施和其他核项目后，伊朗同意签署——但并未批准——所谓的附加协议，允许更广范围的IAEA监督保障。接着，在2004年11月与欧洲代表的谈判中，伊朗同意暂停核浓缩。