The UN's top emergency relief official says the humanitarian crisis is being contained in Sudan's Darfur region.
Egeland is on a five-day visit to Sudan
Jan Egeland praised the effort of aid workers but said the same kind of will was needed to end the violence.
He said the world had failed utterly to support African Union peace efforts where some 1,900 troops monitor an area the size of France.
More than 2m fled their homes and at least 100,000 are believed to have died since a rebellion began two years ago.
Last year the UN described Darfur as the world's worst humanitarian crisis.
The divided UN Security Council will discuss whether sanctions should be imposed on Sudan later on Monday.
A resolution has been considered during the past three weeks which if adopted would freeze the assets and impose travel sanctions on those accused of atrocities in Darfur.
The Janjaweed are accused of widespread atrocities
It would also decide whether an international court should hear cases against them.
"The international community is now set up to send massive humanitarian assistance anywhere in the world and very quickly... but it cannot deploy a proper observer force in half a year," Mr Egeland said.
He said he planned to tell Sudan's Vice-President Ali Osman Taha in talks on Monday that the government was still failing to prevent attacks by Arab militias against the local population.
On the issue of southern Sudan, where a peace deal was recently signed to end a two-decade war, the Security Council will also consider whether to authorise a 10,000-member peacekeeping mission.
Mr Egeland warned during his visit to the south that just 5% of the required funds required have so far been given and there was a danger that the world could make a historic mistake if it did not help secure peace there.
The Asian tsunami and the Darfur crisis have both been much more successful at raising funds, he said.