TEHRAN (Press Shia) – The United Nations appealed for $21.9 billion on Tuesday to address 21 humanitarian crises worldwide next year, including $4 billion for Yemen, its largest aid operation.

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The appeal to donor countries does not include the funding requirements for Syria, which are expected to bring the total up to $25 billion, it added, Reuters reported.

Speaking at a news conference on Tuesday, UN aid chief Mark Lowcock also said Yemen will need billions of dollars in external support to finance its 2019 budget.

"There is going to be a need for billions of dollars of support so they can finance core functions of government," he said.

Some 8.4 million Yemenis are facing starvation as a result of the ongoing Saudi-led aggression, although the United Nations has warned that will probably rise to 14 million.

Three-quarters of impoverished Yemen’s population, or 22 million people, require aid.