Russia launched an intense missile and drone barrage at the Ukrainian capital Kyiv in the early hours of Friday, killing four people, Ukrainian President Volodymyr Zelenskiy said, as powerful explosions reverberated across the country.

The barrage included 407 drones and 44 ballistic and cruise missiles, Ukrainian air force spokesperson Yurii Ihnat said.

Russian forces are advancing in the northern Ukrainian region of Sumy, bringing the regional capital within range of their drones and artillery, according to Ukrainian officials and analysts.