Intense fighting has been reported in eastern Ukraine, a day after a peace deal was reached in Minsk.
The fiercest battles were over control of the town of Debaltseve, a strategic town in between rebel-held areas.
The group responsible for monitoring the ceasefire, due to start at midnight on Saturday, says there is still "quite serious live fire" in several areas.
European leaders have warned Russia that it faces additional sanctions if the Minsk agreement is not respected.
BBC journalists in Donetsk heard new shelling on Friday morning, though they said it sounded less intense than in recent days.
Luhansk also came under bombardment overnight - with Russian TV reporting some of the heaviest fighting there in months.
But Ukraine's army said the most ferocious fighting centred on Debaltseve, a railway junction where rebels have besieged government troops in a last-ditch effort to win the town.
"The enemy continues to build up forces in the main areas of the armed conflict. The most tense situation is near Debaltseve," military spokesman Andriy Lysenko told reporters.
Ukrainian troops rumbled towards the town of Debaltseve on Friday where fighting continues to rage
Women embrace as they wait for a bus, carrying evacuees to Russia, to leave Donetsk
On Friday, the Ukrainian military said eleven soldiers had died and 40 more wounded in the previous 24 hours, while rebels said seven civilians had been killed.
Earlier, two more people died when rebels shelled a cafe in Shchastya, near Luhansk, according to the head of the Kiev-controlled regional administration.
The new clashes came amid wider doubts about the peace deal agreed following marathon negotiations between the leaders of Russia, Ukraine, Germany and France.
Troop movements
Michael Bociurkiw, spokesman for the OSCE monitoring group, said they were hopeful the deal would be fully implemented, but said things on the ground remained very turbulent.
"We feel that the Minsk agreements are really the only available roadmap to a sustainable ceasefire. But now unfortunately... there's quite serious live fire in areas like Luhansk, Debaltseve," he said.
He also said monitors had witnessed "significant movements" of unmarked military vehicles and convoys.
Pro-Russian rebels signed the peace agreement but key issues remain to be settled - and Ukrainian President Petro Poroshenko warned that implementation would be difficult.
A new round of EU asset freezes and travel bans against 19 Ukrainian separatists and Russians - in response to deadly fighting in the city of Mariupol in January - will come into effect on Monday regardless of the latest deal.
But German Chancellor Angela Merkel says wider measures, including further sanctions on Russia, could be implemented if the ceasefire is not upheld.
She has called the deal "a glimmer of hope", adding: "It is very important that words are followed by actions."
Ukraine and the West accuse Russia of supplying weapons and personnel to the rebels but Russia denies this.
It reaffirmed that denial on Friday, with Kremlin spokesman Dmitry Peskov insisting it could only be a "guarantor" because it played no direct role in the conflict.
"[Russia] is not a party that has to take action in this matter. We simply cannot do that physically, because Russia is not a participant in this conflict," he said.
- Ceasefire to begin at 00:01 local time on 15 February (22:01 GMT 14 February)
- Heavy weapons to be withdrawn, beginning on 16 February and completed in two weeks - beyond a buffer zone behind the current front line for Ukrainian forces and behind the September front line for separatist forces
- All prisoners to be released; amnesty for those involved in fighting
- Withdrawal of all foreign troops and weapons from Ukrainian territory. Disarmament of all illegal groups
- Ukraine to allow resumption of normal life in rebel areas, by lifting restrictions
- Constitutional reform to enable decentralisation for rebel regions by the end of 2015
- Ukraine to control border with Russia if conditions met by the end of 2015
Ukraine conflict
The human cost
5,486people killed since conflict began in April 2014- 12,972 wounded across eastern Ukraine
- 5.2 million people estimated to be living in conflict areas
- 978,482 internally displaced people within Ukraine, including 119,832 children
Two Minsk accords - what are the differences?
September 2014 February 2015 The ceasefireNo precise timing set.Starts at 00:00 local time on 15 Feb.Withdrawal of heavy weaponsNo timetable, buffer zone of 30km (19 miles) to be created.Buffer zones from 50km to maximum of 140km; withdrawal to start by 16 Feb. Completion within two weeks.Withdrawal of troopsPull-back demanded from existing frontline (at the time of signing the Ukrainian army had pushed the rebels back, but later the rebels made big gains).Ukrainian army pulls back from current frontline, but rebels retreat from 19 Sep 2014 line, so some recent rebel gains will be lost.Control of Ukraine-Russia borderOSCE to monitor border permanently, and security zones to be set up on both sides of border.Ukraine to regain full control of border only after local elections in Donetsk and Luhansk and after a full political settlement - deadline is end of 2015.Release of all hostagesImmediate.To be completed at latest on fifth day after military withdrawal.Economic help for Donetsk/LuhanskProvide humanitarian aid and work to restore normal economic activity (no timetable).Provide humanitarian aid; restore full economic links with Donetsk/Luhansk, including welfare payments and banking services; Ukrainian state to help develop Donetsk/Luhansk and regions' co-operation with Russia.
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