KYIV, UKRAINE — Ukraine has introduced export licenses for key agricultural commodities, and the country’s state-run railway said it will move those exports by rail as the nation remains under siege from Russia’s military invasion, Reuters reported.

Ukraine will require traders to obtain export licenses for wheat, corn and sunflower oil, among other agricultural commodities, Interfax Ukraine news agency quoted a government resolution as saying on Sunday. Earlier Sunday, Ukraine suspended exports of rye, oats, millet and buckwheat.

The world’s largest exporter of sunflower oil, Ukraine has said it can export more than 60 million tonnes of grain, including 33 million tonnes of corn and 23 million tonnes of wheat, in the 2021-22 July-June season.

Ukraine has historically exported its grain, vegetable oils and other food products by ship, but the country’s Black Sea ports have been closed because of Russia’s invasion.

On Sunday, Ukrainian Railways said it was ready to organize “agricultural products delivery by rail urgently” and that it could transport grain to borders with Romania, Hungary, Slovakia and Poland, from where it can be delivered to ports and logistics hubs of European countries.

The agriculture ministry said Ukraine had exported 43 million tonnes of various grains in the 2021-22 season as of Feb. 23.