Ukrainian President Volodymyr Zelenskyy said he wants a tough global response to Russia after its forces fired a missile at a crowded train station, killing at least 52 people. Zelenskyy's voice rose in anger during his nightly address late Friday, when he said the strike on the Kramatorsk train station, where 4,000 people were trying to flee a looming Russian offensive in the east, amounted to another war crime. Russia denied it was responsible for the strike. Among those killed were children, and dozens of people were severely injured. Photos taken after the attack showed corpses covered with tarpaulins, and the remnants of a rocket painted with the words “For the children" in Russian. The Russian phrasing seemed to suggest the missile was sent to avenge the loss or subjugation of children, although its exact meaning remained unclear. The strike seemed to shock world leaders. He said efforts would be taken “to establish every minute of who did what, who gave what orders, where the missile came from, who transported it, who gave the command and how this strike was agreed to.” After failing to take Kyiv in the face of stiff resistance, Russian forces have now set their sights on the eastern Donbas region, the mostly Russian-speaking, industrial area where Moscow-backed rebels have been fighting Ukrainian forces for eight years and control some places. Although the train station is in Ukrainian government-controlled territory in the Donbas, Russia accused Ukraine of carrying out the attack. So did the region's Moscow-backed separatists, who work closely with Russian troops.