How did Russia-Ukraine war trigger a food crisis?

Russian hostilities in Ukraine are preventing grain from leaving the “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% of its sunflower oil and are big suppliers of corn. Russia is the top global fertilizer producer.