On Monday, Riyadh said the Saudi-led coalition would reopen Yemen's ports, days after closing them over a ballistic missile attack reportedly perpetrated by Houthi rebels on the capital.
The United Nations has listed Yemen as the world's number one humanitarian crisis, with 17 million people in need of food, seven million of whom are at risk of starvation. "I think it poses a critical threat to the lives of millions who are already struggling to survive".
"The humanitarian impact of what is happening right now is unimaginable", he said.
"The port at Aden does not have the capacity for commercial and humanitarian cargo, and unless the Red Sea ports in Hodeida and Saleef are opened immediately, the United Nations will not be able to feed 7 million people every month", said United Nations spokesman Stephane Dujarric.
The US-backed coalition has been at war with the Shiite rebels, known as Houthis, since March 2015.
Al-Mouallimi told reports from NY that the Coalition would conduct this process in complete agreement with Yemen's internationally recognized government, to allow the safe delivery of humanitarian aid.
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The decision followed the interception of a missile launched towards the Saudi capital Riyadh, an act described by the alliance as a "dangerous escalation" by the Iran-allied Houthi militia - which controls large segments of Yemen.
More than 2,000 Yemenis have died in a cholera outbreak now affecting almost one million people.
The north of the country has 20 days' stocks of diesel and 10 days' stocks of gasoline, McGoldrick said.
Yemen had commercial wheat stocks for three months for the entire population of 28 million and about 120 days of rice. The humanitarian situation in the war-ravaged Yemen is now one of the deadliest in the world as starvation and lack of medical supplies leave millions at risk - the Saudi blockade of Yemen has added to the country's woes.
Rebel authorities in Yemen said on Tuesday that a Saudi-led air strike had destroyed a navigation station at Sanaa global airport, which is critical to receiving already limited aid shipments.