Food sources for people and their livestock "at risk," agriculture ministry warns, as locust infestation sweeps Horn of Africa.
More than one million people are in need of emergency assistance in the aftermath of devastation wreaked by Cyclone Idai in Mozambique.
Yemen, the Democratic Republic of Congo, Afghanistan and Syria among the eight nations accounting for two-thirds of the total number of people worldwide exposed to the risk of famine, report says.
North Korea's recorded harvest was just 4.95 million tonnes last year, the United Nations said in its assessment.
Aid group Save the Children says thousands of children under 5 years may have died of acute malnutrition since the civil war began in 2015. Meanwhile, UN calls for peace in Hudaida fell on deaf ears as the Saudi-led coalition renewed air strikes.
Millions in Yemen face one of the worst famines the world has seen in decades amid the Saudi-led coalition’s the battle for Hudaida. Here are more details
A joint appeal by the Yemeni and international organisations called for "secure an immediate cessation of hostilities" in the war-torn country, where they warned 14 million people were now "on the brink of famine".
The UN humanitarian chief says the conflict in Yemen has left 11 million people dependent on emergency food assistance and 75 percent of its 22 million people require some form of aid.
Yemen's economy and population of 22 million people depend almost entirely on imports which could face disruption as fighting rages on around the city of Hudaida, home to country's main port.
Save the Children warns of humanitarian crisis after Saudi-backed alliance launched a series of attacks on rebel-held Hudaida port city, saying more than five million children were at risk of famine in the war-torn Arab nation.
People in Yemen confront the world's worst humanitarian crisis in the war-torn country where 8.3 million are entirely dependent on external food aid, the UN says.
Tightening siege by the Syrian regime forces in Damascus' Eastern Ghouta district has pushed around 400,000 people to the verge of famine.
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