A high-stakes Berlin peace summit failed to launch "a serious" dialogue between Libya's warring leaders, Russian Foreign Minister Sergei Lavrov said Sunday, after Commander of Libyan National Army Khalifa Haftar and his rival Fayez al-Sarraj both travelled to Germany but did not meet face to face.

"It is clear that we have not yet succeeded in launching a serious and stable dialogue between them," Lavrov told reporters after the Berlin conference. Nevertheless, the Libyan parties had taken "a small step" forward, he added.