REUTERS

"Over the last day, three Ukrainian soldiers have been injured as a result of military clashes with the Russian-backed insurgents," he said.

"Fortunately, nobody has been killed," Lysenko said.

Ukraine declared a unilateral ceasefire on December 9 ahead of expected peace talks in Minsk. However, the peace talks have been delayed until later this week, and the militants have not observed the ceasefire.

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Ukrainian soldiers were ordered not to return fire if attacked, but some clashes between the sides have occurred, though fewer than before the latest ceasefire was announced.