Ukraine crisis: Kremlin posing 'unacceptable conditions
We are waiting for further detail, but at this stage, it looks like little more than a re-run of the September Minsk agreement, which was also based on a ceasefire and agreed withdrawal of artillery. That agreement slowed, but never completely stopped the fighting - and neither side ever withdrew any of their heavy weapons. Will today's agreement be different?
09.20 A member of the French delegation at talks in Minsk over the Ukraine crisis said it would be difficult for Angela Merkel and François Hollande to get to Brussels on time for a European Union summit on Thursday.
The Ukraine conflict is among the subjects to be discussed at the summit, the source said.
09.19 François Hollande, according to Reuters, confirms the ceasefire. He said they came to a global agreement.
09.16 BREAKING: Vladimir Putin has said a ceasefire will begin from February 15 (Sunday). We are still waiting for statements from the other four leaders.
09.08 Russian news agencies say the demand Mr Poroshenko finds "unacceptable" relates to the demarcation line between the two sides, reports Roland Oliphant.
Ukraine wants a return to the ceasefire line agreed under the original Minsk agreement in September. But Mr Putin wants today's deal to recognise recent rebel gains, which effectively means asking Ukraine to surrender more territory.
Facts on the ground favour the Russian position. The separatist's offensive has lost some momentum in recent days, but they still have the advantage on the battlefield and there is no sign of a Ukrainian counter-offensive that could recover lost ground. If they and Mr Putin refuse to give up their gains, there isn't much Mr Poroshenko can do about it.
08.58 Nine people were killed and 35 more wounded in fresh fighting in eastern Ukraine as marathon peace talks dragged on in Minsk, officials said on Thursday.
"As a result of shelling and clashes two Ukrainian soldiers were killed, 21 more were wounded," Vladyslav Seleznyov, spokesman for Ukraine's General Staff, told reporters.08.50 Ukraine may not be getting a peace deal, but it is getting some money, Roland Oliphant writes.
The International Monetary Fund this morning announced a $17.5 billion rescue plan for Ukraine that could help Kiev stave off looming bankruptcy but will oblige Petro Poroshenko's government to implement painful and potentially deeply unpopular reforms.
Christine Lagarde, the head of the IMF, said the bailout could be a "turning point" for Kiev.
"I am pleased to announce that the IMF team working in Kiev has concluded a staff-level agreement with the Ukrainian government on a new economic reform programme that would be supported by an extended fund facility of about $17.5 billion (15.5 billion euros) from the IMF," Ms Lagarde told a news conference in Brussels.
"It is an ambitious programme; it is a tough programme; and it is not without risk," Ms Lagarde said.
"But it is also a realistic programme and its effective implementation, after consideration and approval by our executive board, can represent a turning point for Ukraine."
08.31 This gif produced by Tom Shiel shows the rebels' control of areas has increased since September.
08.26 The International Monetary Fund and conflict-torn Ukraine have reached a preliminary deal on a new financial rescue plan worth $17.5 billion dollars, the organisation's chief Christine Lagarde said on Thursday, AFP reports.
08.21 To add to the confusion, separatist leaders are now reported to have rejected the outline agreement hammered out by Mr Putin, Mr Poroshenko, Mrs Merkel and Mr Hollande, Roland Oliphant writes from Kiev.
Earlier this morning Vladislav Surkov, a close adviser to Vladimir Putin, was seen leaving Independence Palace, where the talks are taking place. Russian journalists said he had been dispatched to inform Mr Zakharchenko and Mr Plotnitsky of the details of the deal agreed by the four leaders.
08.06 Reuters confirms the leaders of Ukraine, Russia, Germany and France have returned to the negotiating room in Minsk, resuming talks on the Ukraine conflict.
07.57 More from AFP: "There is always hope," said a tired Mr Poroshenko. "We're in non-stop talks, as you can see, the situation is very difficult, Angela Merkel and President François Hollande are helping us a lot, but for now the situation is difficult."
Earlier, a diplomatic source told AFP there was hope that a contact group including representatives of Ukraine, Russia, the rebels and the Organization for Security and Cooperation in Europe (OSCE), which is meeting in parallel, could reach a deal on "concrete implementation" of a failed September peace deal.
One of the main sticking points of the failed September "protocol" is who controls the 400 kilometre (250 mile) stretch of Russia's border with rebel-controlled Ukraine. Kiev accuses Moscow of pouring troops and weapons across the border to bolster the insurgency, charges the Kremlin denies.
Good morning and welcome to the Telegraph's live coverage of the Minsk peace talks. Petro Poroshenko, the Ukrainian president, says there is no good news yet in a break during the marathon four-way peace summit in Minsk. The leaders from France, Ukraine, Russia and Germany have been in talks for 14 hours and it looks set to continue.
Mr Poroshenko told AFP: "Unfortunately there's no good news yet. There are conditions that I consider unacceptable" being posed by Russia, he said, declining to elaborate.