In this interview with Al-Jazeera English, Jadaliyya Co-Editor and former head of political affairs for the Office of the United Nations Special Envoy for Syria Mouin Rabbani discusses the recent US-Russian agreement to establish a ceasefire in Syria and use this as a springboard for the delivery of humanitarian assistance and renewal of a political process. Rabbani identifies the opportunities and pitfalls in the agreement, noting that a main challenge concerns the degree of leverage Washington and Moscow can exercise over their regional and local allies.]