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 briefly posed for photographers and went into a broader meeting involving senior officials. Putin and Poroshenko shook hands before the talks.
Details of a possible peace deal haven't been released but key sticking points at the talks include: Drawing a new line of division: Ukraine wants the same one that was agreed upon in September, while Russia wants a new line that reflects the rebels' significant territorial gains since then.
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Withdrawing Russian troops and equipment from eastern Ukraine: Russia says it does not have any troops and military hardware in the east, a stance scoffed at by Ukraine and NATO. - Securing the Ukraine-Russian border: Ukraine wants to get control back over its border with Russia to stem the flow of Russian fighters and weapons, while Russia says that's up to the rebels who have captured some key border posts.
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.