Protectionist measures by governments around the world during the coronavirus crisis could provoke global food shortages, the UN’s food body has warned. Shortage of field workers and regulations like tariffs and export bans could lead to problems in the coming weeks. Kazakhstan, for instance, has reportedly banned exports of wheat flour, of which it is one of the world’s biggest sources. Vietnam, the world’s third biggest rice exporter, has temporarily suspended rice export contracts. “All measures against free trade will be counterproductive. Now is the time to protect the flow of food around the world," said the chief economist of the UN Food and Agriculture Organisation.