Over 10 million Yemenis require "immediate assistance to save or sustain their lives," UN humanitarian chief Stephen O'Brien warned on Thursday.
The situation is especially dire among children, he added, with over 2.2 million of them "acutely malnourished" and a child under the age of five dying every 10 minutes of preventable causes.
Also, the 14-million-strong country could run out of wheat in just months, with supply chains crippled by the civil war that started in September 2014.
"If there is no immediate action, famine is now a possible scenario for 2017," O'Brien told the UN Security Council.
The Security Council called on the warring parties to "allow safe, rapid and unhindered access" for aid, including food, and noted the "widespread and acute malnutrition on the verge of famine."
Jamie McGoldrick, U.N. Humanitarian Coordinator in Yemen, said the Arab peninsula's poorest country had only three months
left of wheat stocks and that was also likely to be the case for other key food grains such as rice.
"If we have only got three months supply, there is a possibility there will be a gap for a period of time," he said on the sidelines of a Yemen aid forum in London this week.
"One of the big concerns is how do we get liquidity into the system to allow people like importers to bring in these key commodities?," he said. "What happens next, no one is quite sure."
McGoldrick said an "informal economy" generated some food, but it was not enough to meet the basic needs of the population.
In the past, the UN has repeatedly raised alarm over the fighting in the poverty-stricken nation, sending out a special envoy, Ismail Ould Cheikh Ahmed, to mediate in the conflict between Houthi rebels and the internationally recognized government. However, with the Saudi military backing the cabinet and Iran allegedly arming the Houthis, the conflict has evolved into an arm wrestling match between two rival regional powers.
Hadi refusing to discuss peace plan
UN officials have accused both parties of hindering the delivery of aid. The Saudi-led coalition was also under fire for bombing the airport in Sana and the key Hudaydah port, in the country heavily dependant on imports.
Speaking before the UN on Thursday, peace envoy Ahmed slammed Yemen's president Abed-Rabbo Mansour Hadi for rejecting his proposed plan for peace.
"President Hadi continues to criticize the proposals without agreeing to discuss them and this will hinder and impede the path towards peace," he told the council.
However, the Yemen's UN Ambassador Khaled Alyemany restated that his government refuses to accept the Houthi "coup d'etat in any way or form," adding that rebel leaders "must accept a restoration of "constitutional legitimacy" and Hadi's presidency.
"Any other initiative or idea will be unacceptable and irrational because it will not bring about peace," Alyemany said. "It will only bring about superficial solutions and the crisis will continue."
dj/bik/sms (AP, Reuters, AFP)