As the world watches oil and gas prices soar – the next big shock could hit the dinner table. Collectively, Russia and Ukraine are responsible for more than a quarter of global wheat exports and for around 80% of the world’s supply of sunflower oil. Russia — along with ally, Belarus — is also a huge source of fertiliser, accounting for around 15% globally. The war in Ukraine will undoubtedly have a major impact on its agricultural production and exports, putting even more pressure on a system already in crisis. Madeleine Finlay speaks to food policy researcher, Dr Joseph Glauber, about what the war will mean for the supply and cost of food around the world. Help support our independent journalism at theguardian.com/sciencepod