DAKAR (Reuters) – Over 500 civilians died in attacks carried out by armed forces and Islamist groups in Mali from January to March this year, the United Nations said in a report on Monday that detailed a rapid unravelling of an already desperate security situation. The killings represented a 324% rise over the previous quarter and highlighted the failure of Mali’s military junta to limit human rights abuses or stop groups linked to al Qaeda and Islamic State from carrying out campaigns of violence. They come just as Mali cuts ties with former colonial power France and as Wagner Group, a Russia…