Political advisers from Russia, Ukraine, France, and Germany agreed a ceasefire in eastern Ukraine should be observed after long talks in Paris on Wednesday, Russia's chief negotiator, Dmitry Kozak, told reporters.
Many issues concerning a peace settlement for the conflict in eastern Ukraine remained unresolved after eight hours of talks, Kozak told a news conference.
But he said he hoped positions could be narrowed.
He said another meeting of the four countries would be held in two weeks in Berlin.