Russia launched a barrage of hundreds of drones and missiles on Kyiv overnight into Tuesday, killing more than a dozen people in one of its biggest attacks on the Ukrainian capital.

Earlier, Kyiv mayor Vitali Klitschko said on his Telegram channel that a 62-year-old American was found dead in a house opposite where medics were providing assistance to victims of Russia's overnight strike. At least 16 people were killed and 124 others were wounded in the attacks.

A massive overnight Russian strike on Kyiv, the Ukrainian capital, killed 14 people and wounded at least 177 others, Ukrainian officials said.