A Russian missile strike on a nine-story Kyiv apartment building was a sign that more pressure must be applied on Moscow to agree to a ceasefire, Ukrainian President Volodymyr Zelenskyy said Thursday,

Russia launched a barrage of hundreds of drones and missiles on Kyiv overnight, killing more than 20 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.