Russian shelling killed one person and wounded three others in  Kharkiv, Ukraine's second-largest city that has been pounded by Moscow for days.

Moscow has hit Kharkiv -- in Ukraine's northeast close to the Russian border -- with a string of deadly attacks this month.

"Kharkiv region. Three civilians were wounded in the shelling, and a 65-year-old man was killed," Ukraine's national police said.

Authorities said another man was killed in Kupyansk-Vuzlovyi, a village in the Kharkiv region.

"Occupiers shelled Kupyansk-Vuzlovyi. A fire started in a house, and a man born in 1959 died," the Kharkiv region administration said.

It said two other people were wounded in the attack.

The attack came a day after a large-scale Russian attack on energy sites across the country.