At least one person was killed and several others injured as Russia attacked Ukraine for a third successive night Thursday, Ukrainian officials said.

Air defenses shot down all 20 drones that attacked Kyiv and the surrounding region, as well as two Kalibr missiles in other parts of the country, the air force said.

Two people suffered from smoke inhalation during fires caused by falling debris after the downing of the drones over Kyiv, and two were hurt by shrapnel, the Interior Ministry said.

Kyiv mayor Vitali Klitschko said one person had been killed in a fire overnight but the ministry signaled that the blaze may not have been sparked by falling debris, saying the cause was still being determined.

"This night, Russian terrorists again resorted to a mass attack," said Ruslan Kravchenko, the governor of the Kyiv region. British ambassador Melinda Simmons wrote on Twitter: "Pretty nasty night."

A missile and several drones were shot down in the Mykolaiv region in southern Ukraine, damaging several buildings but causing no deaths, President Volodymyr Zelenskyy's office said.

Several hours later, an 85-year-old woman was killed when Russian forces shelled the village of Mykilske in the southern region of Kherson around noon (9 a.m. GMT), regional governor Oleksandr Prokudin said.

Russia, which began its full-scale invasion of Ukraine in February 2022, did not comment on the latest attacks.

There was no easing of airstrikes while NATO leaders met in Lithuania this week for a summit that Zelenskyy said provided Ukraine with "a foundation of security" for the first time since it gained independence in 1991. Heavy fighting also continued.

Although Kyiv says its forces have made progress in the east and south since starting a counter-offensive in June, Russia still occupies swathes of territory and Zelenskyy has said the counterattack has gone more slowly than initially hoped.

Serhiy Cherevatyi, spokesperson for the eastern military command, said Ukraine had enjoyed "partial success" on the southern flanks of the shattered eastern city of Bakhmut and that Ukrainian troops held the strategic initiative there.

He said Moscow's forces were putting up "unbelievable resistance" but had failed in an attempt to break through Ukrainian lines near Lyman and Kupiansk in the east. Such a breakthrough would boost Russian hopes of pushing further west.