Russia bombarded six regions of Ukraine in one of its largest aerial attacks of the three-year war, Ukrainian officials said Friday. The nighttime assault lasted for hours and killed three emergency responders in the capital Kyiv, according to authorities."In total, there were over 400 drone strikes and more than 40 missiles, including ballistic missiles," said President Volodymyr Zelenskyy, speaking at the International Summit of Cities and Regions in Kyiv.