Ukraine on Wednesday accused Russia of carrying out rocket strikes that killed 14 civilians in areas near a nuclear power plant, as the G7 warned that Russian control of the facility "endangers the region".
Overnight strikes in the Dnipropetrovsk region in central Ukraine killed 13 people and injured 11, with five reported to be in serious condition, regional governor Valentin Reznichenko wrote on Telegram.
A woman died after Russian missiles slammed into a village in the Zaporizhzhia region on Wednesday morning, local governor Oleksandr Starukh wrote on Telegram.
Ukraine and Russia have accused each other of imperilling the safety of the vast plant - Europe's largest - by attacking one another in its vicinity.
Rafael Grossi, head of the International Atomic Energy Agency (IAEA), has urged both sides to exercise restraint, warning of the "very real risk of a nuclear disaster".
And foreign ministers from the Group of Seven leading industrialised countries on Wednesday demanded that Russia immediately hand back control of the plant to Ukraine, something Moscow seems unlikely to do.
"It was a terrible night," he said, urging residents to shelter when they hear air raid sirens. "I am asking and begging you... Don't let the Russians kill you," Mr Reznichenk wrote.
Moscow says it does not deliberately target civilians in what it calls its "special military operation" in Ukraine aimed at pre-emptively safeguarding its own security against expansion of the NATO military alliance.
Andriy Yermak, President Volodymyr Zelenskiy's chief of staff, accused Russia of launching attacks on Ukrainian towns with impunity from the Zaporizhzhia nuclear power plant in the knowledge that it was risky for Ukraine to fight back.
"Eighty reactive rockets fired at residential buildings," Mr Yermak wrote on the Telegram messaging service, referring to the attack on Marhanets.
"The terrorist nation is continuing to fight against civilians. The cowardly Russians can't do anything more so they strike towns ignobly hiding at the Zaporizhzhia atomic power station", he wrote.
Ukraine, which accuses Moscow of waging an unprovoked imperial-style war of aggression, says around 500 Russian troops with heavy vehicles and weapons are stationed at the plant, where Ukrainian technicians continue to work.
Russia says its forces are behaving responsibly and doing everything they can to ensure the facility's safety. Moscow has accused Ukrainian forces of shelling the plant, something Kyiv denies.
Valentyn Reznychenko, governor of Ukraine's central Dnipropetrovsk region, said on Wednesday that the Russian attack on Marhanets was carried out with 80 Grad rockets.
More than 20 buildings had been damaged in the town, which is located on the other side of the Dnipro river from the power plant, he said.
The same attack damaged a power line, leaving several thousand people without electricity, he added. A hostel, two schools, a concert hall, the main council building and other administrative buildings had been hit too, he said.
Images supplied by Ukrainian officials showed the rubble-strewn corridor of a school that had apparently been hit with its windows blown out and a residential building pierced by a rocket.
The origin of a series of explosions at a Russian air base in Russian-annexed Crimea a day earlier remained contested, with Moscow saying ammunition stores had detonated and Ukrainian officials hinting Kyiv may have been responsible.
Two US newspapers cited unnamed Ukrainian officials as saying that Ukrainian special forces had carried out an attack on the air base, which had resulted in the destruction of Russian military aircraft there.
