KYIV: Russia flattened a section of an apartment block in Kyiv on Tuesday, its deadliest attack on the Ukrainian capital this year, as a huge barrage of hundreds of drones and dozens of missiles killed at least 16 people and wounded 134.

Ukrainian officials declared a day of mourning on Wednesday for victims of what President Volodymyr Zelensky described as one of the most horrific attacks on the capital during the war.

“Such attacks are pure terrorism. The whole world, the United States, and Europe must finally respond as a civilized society responds to terrorists. (Russian President Vladimir) Putin does this solely because he can afford to continue the war.”

Zelensky said Russian forces had sent 440 drones and fired 32 missiles at Ukraine.

The United Nations Human Rights Monitoring Mission in Ukraine said it was the most deadly attack this year on Kyiv and underscored the dangers of using such weaponry in major cities.