Ukraine has lost nearly 15 percent of its grain storage capacity in the war with Russia, threatening its role as a major food supplier to the world, a new report said Thursday.

The US government-backed Conflict Observatory said the Russians had seized 6.24 million tons worth of food storage capacity and another 2.25 million tons of Ukrainian-held capacity was destroyed.

In all, some 8.5 million of Ukraine’s 58 million tons of storage capacity were destroyed by the war, threatening the country’s future ability to get key shipments of wheat, corn and sunflower oil to the world market, the report said.

As a result, farmers are left without space to store their crops for shipment, which could prevent planting for the next crop, particularly winter wheat, the report said.

“The damage and seizure of Ukraine’s crop storage capacity by Russia and Russian-allied forces threatens to turn Ukraine’s current agricultural crisis into a disaster,” the report said.

“Millions of people around the world rely on Ukrainian agricultural products and are directly affected by price spikes in global commodity markets caused by shortages related to the Russian invasion of Ukraine.”

The report, prepared by the Yale University School of Public Health Humanitarian Research Laboratory and the government’s Oak Ridge National Laboratory for the Conflict Observatory, used satellite photography and object recognition algorithms to assess the damage to storage facilities such as silos and grain elevators around the world Ukraine.

It found that even partial damage at a facility can spoil stored crops.

Most of the captured and damaged facilities are in Mykolayiv, Zaporizhia and Donetsk Oblast, and most parts were located near transport hubs, suggesting that they were damaged by targeted attacks.

“Indiscriminate attacks on crop storage infrastructure may constitute a war crime and a crime against humanity under international law,” the report said.