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"The Tripartite Contact Group ... confirms its commitment to comply with a comprehensive, sustained and indefinite ceasefire, starting midnight December 23, 2017, Moscow time," she wrote in a social network following the Wednesday meeting of the Contact Group.

The previous ceasefire, announced by the TCG on August 23, was set to be enforced August 25, ahead of the school year start, and supposed to become permanent.

Read alsoEscalation in Donbas: 32 attacks on Ukraine troops, 2 KIA's, 6 WIA's in last dayHowever, the parties reported on its first violation within a few minutes after the truce formally came into force.