Fears of a global food crisis are swelling as Russian attacks on Ukraine’s ability to produce and export grain have choked off one of the world’s breadbaskets, fuelling charges that President Putin is using food as a powerful new weapon in his three-month-old war. On 24 May world leaders called for international action to deliver twenty million tons of grain now trapped in Ukraine, predicting that the alternative could be hunger in some countries and political unrest in others, in what could be the gravest global repercussion yet of Russia’s assault on its neighbour. At the World Economic Forum in Davos, Switzerland, where worries about the war’s consequences have eclipsed almost every other issue, speakers reached for apocalyptic language to describe the threat. 'It’s a perfect storm within a perfect storm,' said David Beasley, the executive director of the World Food Programme. Calling the situation 'absolutely critical,' he warned, 'We will have famines around the world.'