The rebel Free Syrian Army has given the government of President Assad 48 hours to observe the UN ceasefire, or they will abandon the truce.
Shashank Joshi, research fellow at Rusi told the Today programme's Mike Thomson that the opposition is a "multi-layered fragmented thing".
Alistair Crooke, of Conflicts Forum explains that Syrians who are seeking political reform are "caught between a rock and a hard place", as they are either on the "assassination list of the jihadists" or are seen as "collaborators" with the regime.
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