Russian strikes kill at least 10 across Ukraine

Russian strikes have killed at least ten people across Ukraine, six in Dnipro and four in the capital Kyiv.

Dozens more were injured, including several children, after overnight airstrikes hit apartment blocks. Emergency crews searched for people feared trapped under rubble in Kyiv.

Air raid warnings were in place across most of Ukraine early Tuesday.

Moscow last week warned it would launch systematic strikes on Ukraine in response to a drone attack last month on a dormitory in the Russian-held Luhansk region that killed 21 people.

Large plumes of smoke rose from central Kyiv. Mayor Vitali Klitschko urged people to stay in shelters. The head of Kyiv's Military Administration, Tymur Tkachenko, said the enemy is striking with ballistic missiles.

Klitschko said there are fears people remain trapped under damaged buildings.

In Russia, the Krasnodar Krai emergency response centre reported a fire at the Ilsky Oil Refinery after a drone attack. There were no casualties, the emergency service said.

As the attacks hit Kyiv through the early morning, residents heard the buzz of drones between more than a dozen loud explosions.

The strikes caused fires near a gas station, a construction site, several apartment blocks and two houses, Klitschko said. Blackouts were reported across the city.

The attacks followed Ukrainian President Volodymyr Zelensky's warning on Monday of a possible large Russian strike. He urged residents to heed air raid alerts.

"Intelligence warnings regarding Russian strikes remain in effect. A massive strike is possible, they have prepared one," Zelensky said in his nightly video address.

Last week Russia said it would target military and decision-making centres in Kyiv and urged foreigners to leave the city. It said the move responded to Ukraine striking a dormitory in Starobilsk.

Ukraine's General Staff said it carried out an attack near Starobilsk on the night of 21-22 May but maintains it struck a Russian military unit.