KYIV—Heavy Russian strikes hit the southern Ukrainian port city of Mykolaiv overnight and early on Sunday, killing the owner of one of the country’s largest grain producing and exporting companies, the local governor said. Oleksiy Vadatursky, founder and owner of agriculture company Nibulon and his wife, were killed in their home, Mykolaiv Governor Vitaliy Kim…

KYIV—Heavy Russian strikes hit the southern Ukrainian port city of Mykolaiv early on Sunday, killing the owner of one of the country’s largest grain exporters, while Russia said a Ukrainian drone struck its Black Sea fleet headquarters in Sevastopol. Oleksiy Vadatursky, founder and owner of agriculture company Nibulon, and his wife were killed in their…