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 United States assesses that Ukraine's drone attack over the weekend hit as many as 20 Russian warplanes, destroying around 10 of them, two U.S. officials told Reuters, a figure that is about half the number estimated by Ukrainian President Volodymyr Zelenskiy.