NATO allies said more arms and equipment will be sent to Ukraine to help restore power supply affected by Russian strikes. Ukrainians on Tuesday fled for bomb shelters after air-raid warning sirens, although the all-clear later sounded across the country.

NATO allies promised more arms for Ukraine and equipment to help restore power supplies cut by Russian strikes, as President Volodymyr Zelenskiy said his forces were defending against attempted Russian advances in multiple regions.

Ukraine's General Staff said on Wednesday its forces had repelled six Russian attacks in the past 24 hours in the eastern Donbas region, while Russian artillery had relentlessly shelled the right bank of the Dnipro River and Kherson city further south.

Ukrainians on Tuesday fled for bomb shelters after air-raid warning sirens, although the all-clear later sounded across the country. In the eastern Donetsk region Russian forces pounded Ukrainian targets with artillery, mortar and tank fire.

Zelenskiy said the Russian military was also attacking in Luhansk in the east and Kharkiv in the northeast, the latter an area Ukraine recaptured in September.

"The situation at the front is difficult," Zelenskiy said in his nightly video address. "Despite extremely large losses, the occupiers are still trying to advance" in Donetsk, Luhansk and Kharkiv. And "they are planning something in the south," he said.

Ukraine regained control of Kherson in the south this month after Russian forces retreated. Reporters could not independently verify the battlefield reports.

Foreign ministers from the NATO alliance, including U.S. Secretary of State Antony Blinken, began a two-day meeting in Bucharest on Tuesday, seeking ways both to keep Ukrainians safe and warm and to sustain Kyiv's military through a coming winter campaign.