Details remained unclear after more than 12 hours of peace talks in the Belarus capital Minsk, with one source saying there was hope agreement could reached and another saying a document would be signed.
But the document, which may be a joint declaration rather than a full agreement, may be signed by lower level envoys rather than by the leaders themselves, the sources said.
Ukrainian President Petro Poroshenko said certain conditions set by Russia at talks in Minsk on the Ukraine conflict were unacceptable but there still was hope, Russian news agency reported on Thursday. Poroshenko said there was no good news yet from the talks, TASS reported, citing Agence France Presse.
The sources said any agreement would however be sent to a "contact group" which includes representatives of the pro-Russian rebels, whose involvement could be crucial.
The discussions came as pro-Moscow separatists tightened the pressure on Kiev by launching some of the war's worst fighting on Wednesday, killing 19 Ukrainian soldiers in assaults near the railway town of Debaltseve.
Fighting has already killed more than 5,000 people, and Washington is now openly talking of arming Ukraine to defend itself from "Russian aggression", raising the prospect of a proxy war in the heart of Europe between Cold War foes.
Chancellor Angela Merkel and President Francois Hollande joined Ukraine's Petro Poroshenko and Russia's Vladimir Putin for a longer-than-expected meeting that began early on Wednesday evening and continued well into Thursday morning.
A Ukrainian presidential aide, Valeriy Chaly, had earlier described the four-way talks as "a battle of nerves".
As the talks began, Poroshenko said that without a de-escalation of the conflict and a ceasefire the situation would get "out of control".
The talks were taking place while an International Monetary Fund mission was negotiating a bailout to save Ukraine from bankruptcy.
Prime Minister Arseny Yatseniuk said on Wednesday he hoped for a deal in the next 48 hours and IMF chief Christine Lagarde said she would make a statement early on Thursday.
If the French and German leaders hoped their peace initiative would be met by conciliatory moves on the ground, the prospect of talks appears to have encouraged the pro-Russian rebels determined to drive home their advantage.
Armoured columns of Russian-speaking soldiers with no insignia have been advancing for days around Debaltseve. Last week they captured the small town of Vuhlehirsk next to Debaltseve.
On the Russian side of the border, Moscow announced war games on Tuesday on the eve of the talks.
The United States has been openly discussing arming the Ukrainian government, a move that is opposed by European allies who say it would escalate the conflict while falling far short of giving Kiev the firepower needed to win.
President Barack Obama says he has yet to make up his mind on the question of sending weapons. He spoke by phone to Putin on Tuesday, and the White House said he warned the Russian leader that the costs would rise if Moscow kept aiding the separatists.Güncelleme Tarihi: 12 Şubat 2015, 14:07