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.

Ukraine said its “Operation Spiderweb” attacked Russian warplanes worth hundreds of millions of dollars, utilizing drones that each cost under $1,000 and were launched from wooden containers carried on trucks.