Ukraine’s interior minister died Wednesday in a helicopter crash near the capital that killed at least another 14 people, including other officials and three children, authorities said.

Interior Minister Denys Monastyrskyi, who oversaw Ukraine’s police and emergency services, is the most senior official to die since Russia invaded nearly 11 months ago. His death, along with two others from his ministry, was the second calamity in four days to clobber Ukraine, after a Russian missile strike on an apartment building killed dozens of civilians.