Russian attack on Ukraine's Kharkiv kills four: governor

A Russian attack on Ukraine's northeastern city of Kharkiv killed four people and wounded several others, the regional governor said Tuesday.

"The number of people killed in the enemy attack on the outskirts of Kharkiv has reached four," Oleg Synegubov posted on Telegram.

He also said six people were wounded in the overnight hit.

White helmeted emergency workers could be seen clambering through the still-smoking wreckage of a building occupied by postal company Nova Poshta, in a video posted by the regional prosecutor's office.

Within Ukraine's second city, Kharkiv Mayor Igor Terekhov said a Russian long-range drone struck a medical facility for children, causing a fire. No casualties were reported.

The overnight strikes hit other regions as well, including southern city Odessa.

Residential buildings, a hospital and a kindergarten were damaged, with at least five people wounded in two waves of attacks, regional governor Sergiy Lysak said.

Moscow has pummelled Ukraine with daily drone and missile barrages in recent months, targeting energy infrastructure and cutting power in the frigid height of winter.

Russia's use last week of a nuclear-capable Oreshnik ballistic missile on Ukraine sparked condemnation from Kyiv's allies, including Washington, which called it a "dangerous and inexplicable escalation of this war".

Moscow on Monday said the missile hit an aviation repair factory in the Lviv region and that it was fired in response to Ukraine's attempt to strike one of Russian President Vladimir Putin's residences -- a claim Kyiv denies.