Russian forces continue to storm Sievierodonetsk in the Luhansk region and now control the eastern part of the city, Governor Serhiy Gaidai said on Sunday, adding that parts of the Azot chemical plant were damaged in Saturday's attacks.

Ukrainian President Volodymyr Zelenskyy called the situation in Sievierodonetsk "extremely difficult" on Saturday, as urban combat continues.

(With input from Reuters)