At least two people were killed in Ukraine's second city, Kharkiv, in Russian shelling on Saturday afternoon, local officials said.

The shelling hit an area of “dense residential development”, according to city mayor Ihor Terekhov. He said that 18 people were wounded, along with the two dead reported by regional governor Oleh Syniehubov.

Russia launched a new barrage of missiles and drones in an overnight attack on Ukraine, officials in Kyiv said on Saturday, damaging energy facilities in the southeast and west and injuring at least two workers.

Ukraine is struggling with a new wave of rolling blackouts after relentless Russian attacks on energy infrastructure that started three months ago took out half the country's power generation capacity. In its eighth major attack on energy facilities overnight, Russia fired 16 missiles and 13 Shahed drones, the Ukrainian air force said.

Ukraine's air defences intercepted 12 of the 16 missiles and all 13 drones launched by Russia, the air force said.

State-owned power grid operator Ukrenergo said the strikes damaged equipment at facilities in southeastern Zaporizhzhia and the western Lviv region.

Two energy workers were injured in Zaporizhzhia when a fire broke out at an energy facility, according to regional Gov. Ivan Fedorov.

With no major changes reported along the 1,000-km front line, where a recent push by the Kremlin's forces in eastern and northeastern Ukraine has made only incremental gains, both sides have taken aim at infrastructure targets, seeking to curb each other's ability to fight in a war that is now in its third year.

Moscow's overnight attack on Zaporizhzhia and Lviv follows Ukrainian military strikes on three oil refineries in southern Russia overnight into Friday.

Air defences destroyed five drones over the Sea of Azov and the country's western Bryansk and Smolensk regions, the Russian ministry of defence said. A man was killed in shelling of Russia's Belgorod region, which borders Ukraine, according to regional governor Vyacheslav Gladkov.