About half of Ukraine's capital Kyiv is left without power supply on Friday following Russia's strikes on critical infrastructure that led to massive outages, according to local officials.

On Wednesday, Russia carried out missile strikes against Ukraine, resulting in 10 deaths, said Ukrainian authorities, adding that the attack disconnected all four of the country's operating nuclear power plants and other major power facilities from the grid.

The Kyiv city military administration said on Telegram that water has been fully restored and emergency crews are working fast to restore heat to the city, CNN reported.

Ukrainian armory destroyed

A large depot for weapons and ammunition belonging to Ukraine's armed forces has been destroyed near Vilniansk outside Zaporizhzhia, TASS news agency reported Friday.

Russian forces delivered a strike on the Ukrainian armory and there were more than six secondary explosions after the attack.

The Ukrainian side said Russia struck the outskirts of Zaporizhzhia overnight into Friday. The Dnipropetrovsk region, across the river from the Zaporizhzhia nuclear power plant, also reported shelling. 

No casualties are reported, but details of the shelling are still being clarified, according to CNN.

NATO vows to continue to aid Ukraine

NATO Secretary General Jens Stoltenberg said on Friday that NATO is determined to help Ukraine defend itself against Russia for "as long as it takes" and will help the country transform its armed forces into a modern army up to Western standards.

Speaking to reporters ahead of a meeting of NATO foreign ministers in Romania next week, Stoltenberg urged countries to keep providing air defense systems and other weapons to Ukraine.

"NATO will continue to stand with Ukraine for as long as it takes. We will not back down," he said. "Allies are providing unprecedented military support, and I expect foreign ministers will also agree to step up non-lethal support."

(With input from agencies)