Ukraine, Rebels Agree to New Ceasefire But separatist infighting could pose a problem By Newser Editors and Wire Services Posted Dec 2, 2014 1:56 AM CST 3 comments Comments Ukrainian servicemen run near Trehizbenka village, in the Luhansk region of eastern Ukraine, Sunday, November 23, 2014. (AP Photo/Evgeniy Maloletka) (Newser) – Ukrainian government troops and Russian-backed separatist forces in the Luhansk region have agreed on a new ceasefire, international monitors said. The Organization for Security and Cooperation in Europe said that under the agreement, hostilities are to cease Friday along the line of contact between the warring sides. It was agreed at negotiations that took place Saturday that heavy weapons will start being withdrawn from the front over the weekend, the OSCE said in its daily update report last night. Igor Plotnitsky, the head of the rebel movement in Luhansk, confirmed the ceasefire deal in remarks to Russia's Interfax news agency, but he said no definitive agreement had been reached on the breadth of the demilitarized zone. He told Interfax the distance could range between 10 and 13 miles. Ceasefire deals have been reached before in eastern Ukraine, only to be swiftly violated. There are concerns that any efforts to impose a ceasefire in the Luhansk region could be derailed by infighting among separatist forces.