Russia’s war in Ukraine is preventing grain from leaving “breadbasket of the world” and making food more expensive across the globe, threatening to worsen shortages, hunger, and political instability in developing countries. Together, Russia and Ukraine export nearly a third of the world’s wheat and barley, more than 70 percent of its sunflower oil and are big suppliers of corn. World food prices were already climbing, and the war has made things worse, preventing some 20 million tonnes of Ukrainian grain from getting to the Middle East, North Africa, and parts of Asia.