REUTERS/Abdalrhman Ismail 6/7 left right Rebel fighters walk by damaged buildings near Castello road in Aleppo, Syria September 16, 2016. REUTERS/Abdalrhman Ismail 7/7 By Lisa Barrington and Osman Orsal | BEIRUT/CILVEGOZU, Turkey BEIRUT/CILVEGOZU, Turkey The United States and Russia said on Friday they wanted to extend the four-day-old ceasefire in Syria they have co-sponsored, although the agreement looked increasingly shaky, undermined by increasing violence and a failure to deliver aid. The second attempt this year by the Cold War-era superpower foes to halt the conflict has succeeded so

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