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Ukrainian servicemen stand next to a 85 mm 'Vasilyok' automatic mortar in Peski willage, in the Donetsk region, on November 7, 2015 before a weapons withdrawal. Ukraine's pro-Russian insurgents said on November 5, 2015 they had withdrawn all of their smaller weapons from a deadly buffer zone in the ex-Soviet state's separatist east. Monitors from the Organization for Security and Co-operation in Europe (OSCE) say they have been barred by rebels from accessing the area and have seen arms that had moved away from the front later return to their original posts. AFP PHOTO/ ALEKSEY FILIPPOV (Photo credit should read ALEKSEY FILIPPOV/AFP/Getty Images)

Ukrainian servicemen stand next to a 85 mm 'Vasilyok' automatic mortar in Peski willage, in the Donetsk region, on November 7, 2015 before a weapons withdrawal. Ukraine's pro-Russian insurgents said on November 5, 2015 they had withdrawn all of their smaller weapons from a deadly buffer zone in the ex-Soviet state's separatist east. Monitors from the Organization for Security and Co-operation in Europe (OSCE) say they have been barred by rebels from accessing the area and have seen arms that had moved away from the front later return to their original posts. AFP PHOTO/ ALEKSEY FILIPPOV        (Photo credit should read ALEKSEY FILIPPOV/AFP/Getty Images)