Ukrainian forces reported heavy Russian shelling and attempts to advance on several towns in the eastern region of Donetsk that has become a key focus of the near six-month war, but said they had repelled many of the attacks.

The General Staff of Ukraine's armed forces also reported Russian shelling of more than a dozen towns on the southern front — particularly the Kherson region, mainly controlled by Russian forces, but where Ukrainian troops are steadily capturing territory.

Much attention has been focused on the Zaporizhzhia nuclear plant in southern Ukraine amid fears of a catastrophe over renewed shelling in recent days that Russia and Ukraine blame on each other.