Ukrainian Agriculture Minister Roman Leshchenko resigned on Thursday, an aide told Reuters, without giving a reason.

The aide, who did not want to be identified, said parliament would vote on whether to accept the resignation as soon as Thursday.

Leshchenko’s resignation was reported earlier on Thursday by the APK-Inform consultancy, four weeks after Russia invaded Ukraine, sparking a war that has hampered spring crop sowing and Ukraine’s ability to export agricultural products.

Leshchenko told Reuters in an interview this week that Ukraine’s spring crop sowing area may more than halve this year from 2021 levels to some 7 million hectares, versus 15 million hectares expected before the Russian invasion.

Ukraine is a major global agriculture producer and exporter, and the hostilities may sharply reduce the 2022 harvest and exports in the forthcoming 2022/23 season.

Ukraine has already suspended exports of rye, oats, millet, buckwheat, salt, sugar, meat and livestock since the invasion, and introduced licenses for wheat, corn and sunflower oil exports.