http://en.wikipedia.org/wiki/United_Nations_Security_Council_and_the_Iraq_War
February 5, 2003: Powell briefs the Security Council in an effort to persuade members that Iraq is subverting the inspections process. He publicly presents intelligence for the first time to support Washington's claim that Iraq is hiding weapons of mass destruction and interfering with inspections.
March 7, 2003: UNMOVIC Executive Chairman Hans Blix tells the Security Council that Iraq's cooperation with the inspectors in providing information about past weapons activities has improved, although Baghdad has not yet complied with its disarmament obligations. UNMOVIC and IAEA inspectors had stated during briefings to the Security Council on January 27 and February 14 that Iraq was gradually increasing its cooperation with the United Nations. Yet, both deemed the cooperation insufficient.
http://www.armscontrol.org/factsheets/iraqchron