The sources said on Thursday Gabriel had demanded Russia do what it can to ensure the implementation of an agreement to withdraw weapons on the front line in places with heavy fighting, agreed on Wednesday by the Minsk contact group, as reported by Reuters.

Read alsoExperts on policies of Germany’s new FM: no changes regarding Ukraine as long as Merkel plays first fiddle"That is essential to strengthen the ceasefire .. which is far too fragile," German diplomatic sources said after talks between Gabriel and Lavrov in Bonn where G20 foreign ministers are meeting.