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。
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.