UN chief António Guterres 'alarmed' by resurgence of fighting in Syrian civil war after hundreds killed in Aleppo offensive  ABC NewsUS urges push for Syria de-escalation  news.com.auUS, Germany, France and UK call for de-escalation in Syria  EuronewsUN urges immediate ceasefire, dialogue amid latest conflict in Syria  China DailyUS says no change in Syria policy, al-Assad a ‘dictator with blood on his hands’  Al Arabiya English