The UN humanitarian chief Martin Griffiths speaks to the media. File/AFP

The UN humanitarian chief had a dire message for leaders of the world’s 20 largest economies meeting this weekend: Worry about Afghanistan because its economy is collapsing and half the population risks not having enough food to eat as the snows have already started to fall.

Martin Griffiths said in an interview Friday with The Associated Press that "the needs in Afghanistan are skyrocketing."

Half the Afghan children under age five are at risk of acute malnutrition and there is an outbreak of measles in every single province which is "a red light” and "the canary in the mine” for what’s happening in society, he said.

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Meanwhile, Taliban government is pressing for the release of billions of dollars of central bank reserves as the drought-stricken nation faces a cash crunch, mass starvation and a new migration crisis.

Afghanistan parked billions of dollars in assets overseas with the US Federal Reserve and other central banks in Europe, but that money has been frozen since the Taliban ousted the Western-backed government in August.

A spokesman for the finance ministry said the government would respect human rights, including the education of women, as he sought fresh funds on top of humanitarian aid that he said offered only "small relief".

One top central bank official called on European countries including Germany to release their share of the reserves to avoid an economic collapse that could trigger mass migration towards Europe.

Griffiths warned that food insecurity leads to malnutrition, then disease and death, and "absent corrective action” the world will be seeing deaths in Afghanistan.

He said the World Food Program is feeding 4 million people in Afghanistan now, but the UN predicts that because of the dire winter conditions and the economic collapse it is going to have to provide food to triple that number — 12 million Afghans — "and that’s massive.”