Russian Strike on Kryvyi Rih

A Russian missile strike in Ukrainian President Volodymyr Zelensky's hometown of Kryvyi Rih left three dead and dozens wounded, in an attack Kyiv warned would not go "unpunished".

The strike came hours after Russia said it had repelled a series of brazen cross-border raids by pro-Ukrainian militias, who burst into its territory and claimed to seize control of a village.

Rescuers in Kryvyi Rih could be seen evacuating wounded civilians from a burning multi-storey residential building in a video published by Kyiv's interior ministry.

Zelensky said a residential building nine storeys tall was hit and offered his condolences to those affected in his evening address.

"We will inflict losses on the Russian state in response -- quite rightly. They in the Kremlin must learn that terror does not go unpunished for them," he said.

Hours earlier, Russia said it had suppressed a series of armed attacks by pro-Ukrainian militias on its border regions using heavy artillery fire.

Groups of pro-Kyiv volunteer fighters, made up of Russians who oppose the Kremlin, said earlier that they had broken into the Kursk and Belgorod regions bordering Ukraine. Moscow said it had responded with rockets and "flame-throwing".

Moscow denied that the fighters had made ground, and later said it had repelled all incursions from its territory.

Kyiv launched one of its most significant drone strikes on Russia so far in the two-year war.

Two Russian energy sites, including one of the largest oil refineries some 800 kilometers from the border, were hit overnight, Russian officials said.

Ukraine has justified attacks on Russian energy sites as legitimate targeting of infrastructure used to fuel the invasion. It did not claim responsibility for strikes.