President Trump said the Russian leader Vladimir Putin had warned that he would retaliate for a covert Ukrainian attack in Russia last weekend that destroyed dozens of Russian bombers.

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

Russia mounted an intense and sustained barrage of Kyiv overnight, with missiles and drones targeting the Ukrainian capital where there was a succession of large explosions, Reuters reporters in the city said.