Air raid sirens rang out in Ukraine’s capital as an overnight Russian missile and drone attack killed at least four people and injured 20 others. The attack followed a warning from President Putin that Russia would hit back after Ukrainian drones destroyed several strategic bomber aircraft deep inside Russia.

A Russian missile and drone attack on Kyiv killed at least four people and injured 20 others, city mayor Vitali Klitschko said. It was part of a wider overnight assault that became the latest in a series of large-scale attacks targeting regions across Ukraine.