"Northwestern Syria has seen a dramatic escalation of conflict since late April affecting northern Hama, southern Idlib, and western Aleppo governorates," the World Food Programme says.
Houthi rebels deny accusations of selling aid meant for civilians, saying the World Food Programme instead sent "rotten food" to the war-torn Arab country which "is not suitable for human consumption".
UN Yemen envoy Martin Griffiths says all warring parties have given firm assurances to attend peace talks which will be held soon in Sweden as 8.4 million people, including children, are on the brink of starvation in the warring country.
It is the first aid convoy to reach the besieged suburb of Houla in Homs since June. The UN says there are over half-a-million people living in 18 areas across Syria that are besieged by warring sides in the conflict that begin five years ago.
A UN-backed food security report said South Sudan is no longer classified as being in famine, although the situation is still critical and millions face food insecurity.
About 100,000 people face immediate starvation, with millions more on the brink of famine. The UN warns that nearly half of South Sudan's population will be without food by July if no action is taken.
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