Steelworkers have reportedly taken control of the eastern Ukrainian city of Mariupol from pro-Russian forces. The workers launched citizen patrols in multiple cities this week after they were urged to take action by their boss, Rinat Akhmetov, Ukraine’s richest man. The United Nations, meanwhile, has warned of an “alarming deterioration” in human rights in the region. Western-backed talks on the crisis opened in Kiev this week, but pro-Russian separatists were excluded.