Contact group on Ukraine has begun the hearing of the sub-group on security, said Last news source close to the negotiations. first source reported that the Contact group heard the results of the work of the subgroup on political issues and went on hiatus. "Ended break in the work of the contact group, and the participants hear the results of the work of the subgroup on safety ", - said the head of the Department. He added that the main issue discussed by this group, is the draft Treaty on the withdrawal from the separation line in the Donbass weapons of the calibre less than 100 mm and tanks.