UN Secretary General António Guterres and Ukrainian President Volodymyr Zelensky discussed efforts to set up humanitarian escape corridors from Mariupol, which has been extensively damaged after weeks of fighting. “Mariupol is a crisis within a crisis, thousands of civilians need life-saving assistance,” Guterres said at a press conference after the meeting in Kiev on Thursday. They need an escape route to escape the “apocalypse,” he said. Guterres told Zelensky that when he spoke with Russian President Vladimir Putin on Tuesday he had received a commitment in principle that the United Nations…