"Haftar has said that there are some preconditions that he has previously put forward to sign the agreement", the source said, adding that Haftar did not specify them.
The negotiations between Haftar and Dendias lasted more than an hour and a half. Later on 17 January, Haftar is also expected to meet with Greek Prime Minister Kyriakos Mitsotakis.
The UN-led conference on the Libyan crisis settlement is scheduled to be held in the German capital on 19 January. Libyan National Army (LNA) head, Field Marshal Khalifa Haftar, and Fayez Sarraj, the head of the rival GNA, are also expected in Berlin.
Libya has been torn apart between the two rival administrations since 2011, when its long-time leader Muammar Gaddafi was overthrown and killed, with the LNA controlling the east and the Tripoli-based GNA sitting in the country’s west.