U.N. Secretary-General Antonio Guterres said all sides need to put pressure on the warring parties in Libya.
Libya's oil production and exports have ground close to a halt as the increasingly unpredictable Gen Khalifa Haftar, the military leader in the country's east, ignores global calls to seek a negotiated political settlement to the civil war.
The head of the Government of National Accord (GNA) in Libya has called for the deployment of an global force in case renegade General Khalifa Haftar resumes hostilities.
German Chancellor Angela Merkel told reporters at the conclusion of the summit that the backers of the rival Libyan sides had agreed a truce reached in Tripoli over the past week should be turned into a permanent cease-fire to allow a political process to take place.
Putin on Sunday said he hoped that the Berlin summit on Libya could bring further progress and that Moscow's peace efforts had yielded results.
Among those who attended on January 19 were Turkish President Recep Tayyip Erdoğan, Russian President Vladimir Putin, French President Emmanuel Macron, Italian Premier Giuseppe Conte, British Prime Minister Boris Johnson and U.S. Secretary of State Mike Pompeo.
The UN secretary-general emphasised that all parties at the meeting agreed that there could not be a military solution.
Also asked if the EU's naval mission off the Libyan coast could be restarted, he said: "I think we have to revive it, yes".
Erdoğan defended his troop presence in Libya, claiming the Russian security company Wagner had 2,500 security personnel in the country working for Haftar.
Trump impeachment trial: Schumer vows to "force votes" on witnesses
But one of Trump's lawyers, Alan Dershowitz , best known for defending celebrity clients like Mike Tyson and O.J. They say, unequivocally, that the president should be convicted and removed from office.
Man United's Rashford misses Liverpool clash out 'for weeks' - Solskjaer
Marcus Rashford has vowed to return for Manchester United "fitter than ever" as he recovers from a stress fracture of the back. We didn't have quality with our finishing or last pass. [Midfielder] Fred was absolutely top and [goalkeeper] David de Gea.
Norway populist party quits coalition over 'Isis bride' repatriation
Jensen said many believed that the woman, who has not been named, "used her child as a shield to come back to Norway". The 29-year-old Norwegian woman, who is of Pakistani origin, was married to an Islamic State fighter.
Guterres said at the start of the conference that world leaders "are here for an urgent and pressing reason: to stop Libya's downward spiral".
The French president said the deployment in Libya of fighters from Syria and other foreign forces must stop immediately.
Turkey and Russian Federation have both been criticized by United Nations and Western officials who say their efforts to arm their allies have intensified violence.
The Turkish president also warned that Ankara would not hesitate to "do what is necessary" should Haftar's forces violate the truce.
British forces could help police a future ceasefire in Libya, Boris Johnson said on Sunday as he attended a summit aimed at trying to resolve the conflict in the North African country.
After chairing talks between European Union foreign ministers in Brussels, Borrell said that the bloc will also examine ways to help monitor a cease-fire in the conflict-torn country once one actually comes into force and replaces the shaky truce now in place.
Erdogan announced earlier in January that he had dispatched Turkish military elements to Libya to ensure stability for the GNA.
In a sign the situation was deteriorating, the Libyan National Oil Corporation (NOC) reported that forces directly under the instruction of Haftar had blocked oil exports from Brega, Ras Lanuf, Hariga, Zueitina, and Sidra ports.