At least 51 civilians were killed Thursday in a Russian rocket strike on a village store in eastern Ukraine, one of the deadliest attacks in recent months that came as Ukrainian President Volodymyr Zelensky attended a summit of around 50 European leaders in Spain to drum up support from the country’s allies.

A 6-year-old boy was among the dead and seven other people were wounded. Zelensky denounced the attack on the store and cafe in the village of Hroza as a “demonstrably brutal Russian crime” and “a completely deliberate act of terrorism.” He urged Western allies to help strengthen Ukraine’s air defenses, saying that “Russian terror must be stopped”. “The key for us, especially before winter, is to strengthen air defense,” Zelensky said.