By Stephanie Nebehay GENEVA (Reuters) – Russia may have committed war crimes by killing civilians and destroying hospitals in its pounding of Ukrainian cities, the top United Nations human rights official said on Wednesday in her strongest comments yet on the conflict. Addressing the U.N. Human Rights Council in Geneva, Michelle Bachelet urged Russia to end its five-week invasion. “Homes and administrative buildings, hospitals and schools, water stations and electricity systems have not been spared,” she said. “Indiscriminate attacks are prohibited under international humanitarian law and may …