ran also minimizes the significance of the IAEA's inability to verify the exclusively peaceful nature of Iran's nuclear program, arguing the IAEA has only drawn such conclusions in a subset of states that have ratified and implemented the Additional Protocol. The IAEA has been able to verify the non-diversion of declared nuclear material in Iran,[244] but not the absence of undeclared activities. According to the IAEA's Safeguards Statement for 2007, of the 82 states where both NPT safeguards and an Additional Protocol are implemented, the IAEA had found no indication of undeclared nuclear activity in 47 states, while evaluations of possible undeclared nuclear activity remained ongoing in 35 states.[245] Iran ceased implementation of the Additional Protocol and all other cooperation with the IAEA beyond that required under its safeguards agreement after the IAEA Board of Governors decided to report its safeguards non-compliance to the UN Security Council in February 2006.[110] Iran insisted that such cooperation had been "voluntary," but on 26 December 2006, the UN Security Council passed Resolution 1737,[246] invoking Chapter VII of the UN Charter, which among other things required Iran to cooperate fully with the IAEA, "beyond the formal requirements of the Safeguards Agreement and Additional Protocol." The IAEA reported on 19 November 2008, that, while it is "able to continue to verify the non-diversion of declared nuclear material in Iran," it "has not been able to make substantive progress" on "key remaining issues of serious concern" because of a "lack of cooperation by Iran."[247] Iran has maintained that the Security Council's engagement in "the issue of the peaceful nuclear activities of the Islamic Republic of Iran" are unlawful and malicious.[248] Iran also argues that the UN Security Council resolutions demanding a suspension of enrichment constitute a violation of Article IV of the Non-Proliferation Treaty which recognizes the inalienable right of signatory nations to nuclear technology "for peaceful purposes.