President Volodymyr Zelensky said Norwegian diplomats had been among those "who were in the epicentre of the strike" and that the attack underscored the need to strengthen Ukraine’s air defences.
Vladimir Putin's forces had aimed the attack "directly on the city, on ordinary civilian buildings”, he said.
Meanwhile, US president Donald Trump said that his administration was in a “very serious” discussion with Russia about the Ukraine war and suggested he and Mr Putin could take “significant” action towards ending it soon.