World food prices hit an all-time high in March following Russia’s invasion of agricultural powerhouse Ukraine, a United Nations agency said on Friday, adding to concerns about the risk of hunger around the world.

The disruption in export flows resulting from the February 24 invasion and international sanctions against Russia has spurred fears of a global hunger crisis, especially across the Middle East and Africa, where the knock-on effects are already playing out.

Russia and Ukraine, whose vast grain-growing regions are among the world’s main breadbaskets, account for a huge share of the globe’s exports in several major commodities, including wheat, vegetable oil and corn, their prices reached their highest levels ever last month.

Ukrainian ports have been blocked by a Russian blockade and there is concern about this year’s harvest as the war rages on during the sowing season.

The UN Food and Agriculture Organization (FAO) said its Food Price Index, which tracks monthly changes in international prices for a basket of commodities, averaged 159.3 points last month, up 12.6 percent from February. As it is, the February index was the highest level since its inception in 1990.

FAO said the war in Ukraine was largely responsible for the 17.1 percent rise in the price of grains, including wheat and others like oats, barley and corn. Together, Russia and Ukraine account for approximately 30 percent and 20 percent of global wheat and corn exports, respectively.