MINSK, Belarus -- The leaders of France, Germany, Russia and Ukraine engaged in peace talks Wednesday in the Belarusian capital as fighting still raged in eastern Ukraine.
The talks, brokered by German Chancellor Angela Merkel and French President Francois Hollande, aim to negotiate a deal to end the hostilities between Ukrainian troops and Russian-backed separatists that have killed more 5,300 people since April.
In a diplomatic blitz that began last week, Merkel and Hollande visited Kiev and Moscow to speak to Ukrainian President Petro Poroshenko and Russian President Vladimir Putin, paving the way for the talks in Minsk.
"The entire world is waiting to see whether the situation moves toward de-escalation, weapons pullback, cease-fire or ... spins out of control," Poroshenko said upon arriving.
After talking in private for several hours, the four leaders posed for photographers and went into a broader meeting involving senior officials. Putin and Poroshenko shook hands before the talks.
Russia's ambassador to Belarus, Alexander Surikov, said "some progress has been made" but wouldn't offer details.
Details of a possible peace deal haven't been released, but key sticking points at the talks include:
European leaders have warned there's no guarantee a deal will be reached Wednesday with Moscow, which the West says is fueling the insurgency. Germany and France have rushed to mediate after a surge in fighting this year.
In the rebel-held city of Donetsk, rebel officials said five people were killed and nine wounded in a shelling attack Wednesday on a bus station, where an Associated Press reporter saw one body. Officials in Kiev said Wednesday that 19 troops had been killed and 78 wounded in a day of fighting in Debaltseve, a hotly contested transport hub in eastern Ukraine.
Poroshenko posted a statement saying he had made an impromptu visit early Wednesday to the eastern Ukrainian city of Kramatorsk, where Kiev says 16 people were killed and 48 wounded in a rocket strike Tuesday. The city is 30 miles (50 kilometers) from the nearest front line.
"We demand an unconditional peace," Poroshenko said. "We demand a cease-fire, a withdrawal of all foreign troops, and closing of the border ... We will find a compromise within the country."
Later, in comments carried by Interfax-Ukraine news agency, Poroshenko said he was "ready to impose martial law across the country if we are not able to reach an agreement today in Minsk."
At a news conference in Moscow, Russian Foreign Minister Sergey Lavrov said there was "notable progress" in the peace process, but gave no details. He said the most important goal of the talks would be to implement a cease-fire, but warned that Ukraine only could fully re-establish its control over the border with Russia if it offers a degree of autonomy to the east and lifts its economic blockade.
"To give away the Russian part of the border also would be to cut them (the rebels) off even from humanitarian help and allow them to be surrounded," Lavrov said.
French Foreign Minister Laurent Fabius said early Wednesday that "quite a number of problems remain" in negotiations, including the future of eastern Ukraine, guarantees about the Ukraine-Russia border, and the prospects of a possible cease-fire, weapons pullback and prisoner exchange.
Fabius said the aim of the talks is to win an accord that works on the ground, "not just one on paper."
Russia's envoy to the European Union, Vladimir Chizhov, said he expects a deal to be reached but added that "no one can give a 100 percent guarantee for that."
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