A summit opening shortly at the UN in Geneva hopes to raise $4.2bn (£3.2bn) to fund humanitarian operations in Yemen, where a years-long war has left the country on the brink of famine.
It is the largest single country appeal ever made by the UN, which plans to help 19 million people.
An estimated 240,000 people are facing catastrophic levels of hunger.
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Meanwhile, the UN’s Yemen envoy says aid workers could soon access a key granary near the port city of Hudaydah.
Martin Griffiths told the UN Security Council that government forces and Houthi rebels could start to withdraw from around the city as part of a deal reached in December which has yet to be implemented.
