Recent fighting in the Tigray region of Ethiopia has resulted in a famine that is now affecting more than 400,000 people, UN officials say.
In its first public meeting on the crisis, members of the UN Security Council warned that as many as 33,000 children were severely malnourished.
Officials said that a further 1.8m people were on the brink of famine as a result of the eight-month conflict.
They also warned of further clashes despite the declaration of a ceasefire.
The Ethiopian government, which has been fighting regional forces in Tigray, declared a unilateral ceasefire on Monday.
However, rebels vowed to drive their "enemies" from the region and there have been reports of sporadic clashes as pressure builds internationally for all sides in the conflict to pull back.