STOCKHOLM (Reuters) – U.N. Secretary-General Antonio Guterres said on Wednesday he was hopeful of easing the food crisis prompted by the war in Ukraine, but cautioned that any agreement to unblock shipments of commodities such as grain was still some way off. The conflict has fuelled a global food crisis with surging prices for grains, cooking oils, fuel and fertilizer. Russia and Ukraine account for nearly a third of global wheat supplies, while Russia is also a key fertilizer exporter and Ukraine a major supplier of corn and sunflower oil. “I think that there is progress, but we are not yet …