The UN High Commissioner for Human Rights has documented the deaths of at least 780 civilians in Ukraine since Russian troops invaded three weeks ago, with 58 children and young people among the victims. The office said on Thursday it had also verified information about 1,252 people who have been wounded. “Most of the civilian casualties recorded were caused by the use of explosive weapons with a wide impact area, including shelling from heavy artillery and multiple-launch rocket systems, and missile and air strikes,” the UN agency said. The UN High Commissioner for Human Rights, Michelle Bach…