Diplomats say those measures include further curtailing the flow of illegal arms, broadening sanctions against individuals who undermine the peace process and imposing a no-fly zone that would put an end to the government’s aerial campaign against its citizens.

Secretary General Ban Ki-moon asked Council members last week to hold off consideration of further sanctions, to give diplomacy a chance to proceed. But on Monday, Margaret Beckett, the British foreign secretary, and Alejandro D. Wolff, the acting American ambassador, held out the possibility that tougher measures might have to be adopted at some point.

Mr. Wolff expressed doubts about whether Sudan would carry out the agreement announced Monday, adding that he sensed a rising frustration and a diminished tolerance toward Sudan among Council members that could cause them to “consider the need for other measures.”

Image A plane that crash-landed on Feb. 24 during a trip to El Geneina, in Darfur, from Khartoum, Sudan. Sudanese soldiers unloaded howitzers and boxes that, a United Nations panel suspected, contained weapons. Credit... United Nations Panel of Experts on the Sudan

Gerard McHugh of Ireland, the coordinator of the five-person panel that has traveled widely in the region since its creation in June 2005, said he could not comment on the specific findings since they were still confidential, but he said they should be published now. “It’s actually the view of the panel that certain actions could be taken that would actually enhance the peace process rather than holding them back,” he said. To make the report a public document requires the agreement of all 15 Council members.

Marcello Spatafora, the United Nations ambassador from Italy, which leads the sanctions committee, said he had circulated a letter among the other 14 members asking if there were any objections to releasing the document.

Barring objections, he would be free to make the report public in 48 hours, he said.

In the past, China has objected to tough actions against Sudan, and in a closed meeting about Darfur on Monday, China was adamant that talk of sanctions would set back the peace process and lessen the chances of Sudanese compliance with the Council.