The Islamic State of Iraq and Syria (ISIS) is “only 20 miles away” from Syria’s second biggest city of Aleppo, the U.N. peace envoy for Syria Staffan de Mistura said on Thursday.

“I am just determined to raise the fact that Aleppo cannot be abandoned,” De Mistura said, vowing to press on with efforts for a truce in between government and opposition forces in the city.

“We are engaged in intense discussions with the government… and the opposition regarding the freeze,” he said. […]