The USD 2.96 billion will be used to respond to an ever- broadening crisis in Yemen, where war, looming famine and cholera have killed thousands and put millions of lives at risk.
The appeal, made on behalf of UN agencies and humanitarian partners, came as 11.3 million people "urgently require assistance to survive", UN aid agency OCHA said in a statement.
"A generation of children is growing up in suffering and deprivation," OCHA said.
More than 9,200 people have been killed in Yemen since 2015, when a Saudi-led military coalition intervened to back the country's internationally-recognised government against Iran-backed rebels.
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Over the past year, the United Nations' efforts to address what it has described as the world's worst humanitarian crisis have been hampered by a crippling blockade of rebel-held ports by the Saudi-led coalition.
Some 8.4 million Yemenis are also at risk of famine, according to OCHA.
In 2017, international donors provided $1.65 billion of the USD 2.34 billion requested by the United Nations and humanitarian partners in Yemen.
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