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Pro-Russia fighters stand on guard as the OSCE (Organization for Security and Co-operation in Europe) delegation arrives at the crash site of a Malaysia Airlines jet near the village of Hrabove, eastern Ukraine, Friday, July 18, 2014.  Representatives from OSCE and four Ukrainian experts have traveled into rebel-controlled areas to begin an investigation into the downing of the Malaysia Airlines plane on Wednesday and the deaths of all its passengers and crew.  (AP Photo/Evgeniy Maloletka)
Pro-Russia fighters stand on guard as the OSCE (Organization for Security and Co-operation in Europe) delegation arrives at the crash site of a Malaysia Airlines jet near the village of Hrabove, eastern Ukraine, Friday, July 18, 2014.  Representatives from OSCE and four Ukrainian experts have traveled into rebel-controlled areas to begin an investigation into the downing of the Malaysia Airlines plane on Wednesday and the deaths of all its passengers and crew.  (AP Photo/Evgeniy Maloletka)

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Roundtable: Who are Ukraine's rebels?

Where do the rebels end, and Russia begin? In the wake of the downing of MH17, our panel tackles that question.