There were three cease-fire arrangements following the 1990-1991 Gulf war. UNSC Resolution 686, the Safwan Accords, and UNSC Resolution 687. The terms of the Safwan Accords have never been formally published. The Safwan Accords:

"Refer to the cease-fire agreements made between allied military commanders and iraqi officers, under the provisions of Resolution 686, above. On March 3 1991, the U.S. commander, U.S. Army General H. Norman Schwarzkopf, and other allied commanders met with Iraqi offecers at the town of Safwan in southern Iraq and agreed on several matters: return of prisoners of war, removal of mine fields, and procedures to prevent any further outbreaks of fighting between Iraqi and allied forces. The Safwan Accords also provided for a temporary cease-fire line, with the understanding that allied forces would remain in sourthern Iraq until a permanent cease-fire agreement came into effect."

That permanent cease-fire agreement was UNSC Resolution 687, "which established a formal cease-fire and imposed a number of long-term requirements on Iraq."

So UNSC Resolution 687 is the agreement that Iraq would have been in violation of, along with Resolution 1441. The Safwan Accords were superceded by Resolution 687, the terms of the Safwan Accords were never formally published, and from what I have been able to see of the things they covered, they became obsolete after Resolution 687 was adopted. So again, it was a UN resolution that Iraq was in violation of, not the Safwan Accords, and therefore it was the perogative of the UN to decide how Iraq's violations of the relevant UNSC Resolutions should be dealt with.

Report for Congress