Russia attacked the Ukrainian capital and other cities across the country on Sunday with nearly 600 drones and dozens of missiles, killing at least four people in Kyiv and injuring dozens more in an hourslong assault.

“A massive Russian attack on Ukraine lasted for more than 12 hours,” President Volodymyr Zelensky of Ukraine said in a statement. “Savage strikes, a deliberate, targeted terror against ordinary cities.”

The Ukrainian Air Force said the attack started at 8:30 p.m. on Saturday and continued into Sunday morning. Nearly 600 drones and 48 missiles were launched in the assault, it said in a statement, adding that five missiles and 31 drones had evaded air defenses.

Ukrainian officials said that more than 70 people were wounded across the country, including two rescue workers. They warned that the number of dead and injured was likely to rise as 1,500 rescue workers and police officers were deployed across 11 regions to treat the wounded and search for survivors.

Mr. Zelensky vowed to respond to the latest strikes as he urged Ukraine’s allies to maintain pressure on Russia to agree to an immediate cease-fire.