Both the government troops and the separatists agreed during the weekend to pull their big guns 25 to 70 kilometers (15 to 43 miles) back, depending on the type of the weapon, thus creating a buffer zone.
However, Ukrainian military spokesman Anatoliy Stelmakh told reporters that the move will not start before rebel attacks stop completely, in accordance with the conditions of the truce, Deutsche Welle reported on Monday.
Stelmakh said there were two artillery attacks overnight and although this is significantly fewer than in previous days, "as long as firing on Ukrainian military positions continues, it's not possible to talk about a pullback."
Kyiv is only willing to start pulling back its heavy weapons once there has been a total cessation of firing for a whole day, according to army sources.