Russia is ready to take part in a four-way summit in Paris to try to breathe life into the stalled Ukrainian peace process but has strict preconditions for such a meeting, a senior Kremlin aide said on Friday.

Kiev’s forces have been battling pro-Russian separatists in the Donbass region of eastern Ukraine since 2014 in a conflict that has claimed more than 13,000 lives. Sporadic fighting continues despite a ceasefire agreement.

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