THE head of the UN’s World Food Programme (WFP) told billionaires it is “time to step up” as the global threat of food insecurity rises with Russia’s war in Ukraine.

Agency executive director David Beasley said he has seen encouraging signs from some of the world’s richest people, like Elon Musk and Jeff Bezos.

He built upon a social media back-and-forth he had with Musk last year, when the Tesla CEO challenged policy advocates to show how a $6 billion (£4.8 billion) donation could solve world hunger.

Since then, “Musk put six billion dollars into a foundation but everybody thought it came to us, but we ain’t gotten any of it yet, so I’m hopeful,” Beasley said at the World Economic Forum in Davos, Switzerland, where some of the world’s biggest elites gathered.

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“I don’t know what it’s going to take,” he said of Musk.

“We’re trying every angle, you know: Elon, we need your help, brother.”

Musk and Bezos did not immediately respond to emails or other messages seeking comment.

Musk, the world’s richest man, donated about five million shares of company stock worth roughly $5.7 billion (£4.5 billion) to an unidentified charity in November, according to a regulatory filing.

It came after Musk tweeted in late October that he would sell $6 billion (£4.8 billion) in Tesla stock and give the money to the World Food Programme if the organisation could show how the money would solve world hunger.

The US Securities and Exchange Commission filing did not name any recipients of Musk’s donation.

Beasley said yesterday his message was not just to those two high-profile tech mavens, but other billionaires too.

“The world is in real serious trouble. This is not rhetoric and BS. Step up now, because the world needs you,” he said.

Ukraine and Russia together export a third of the world’s wheat and barley and half of its sunflower oil, while Russia is a top supplier of fertiliser that has surged in price.

The Kremlin’s forces are accused of blocking Ukrainian ports, and the interruption of those affordable food staples is threatening food shortages and political unrest in countries in Africa, the Middle East and Asia.

The threat to the global food supply has been a pressing concern for officials.

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UN secretary-general Antonio Guterres said last week that he was in “intense contacts” with Russia and other key countries and is “hopeful” of an agreement.

This would allow the exportation of grain stored in Ukrainian ports and ensure Russian food and fertiliser have unrestricted access to global markets.

If Ukraine’s supplies remain off the market, the world could face a food availability problem in the next 10 to 12 months.

“That is going to be hell on Earth”, Beasley said.