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“At this time the cease-fire agreement is not being fully observed,” he said. He didn’t say when the supposed breach was to have occurred.

Lysenko said Ukrainian forces were strictly observing the cease-fire and suggested that Zakharchenko’s claim was a provocation.

Ukraine had received information that the rebels on Friday “were preparing a press conference for today (in which) one of the points was the condemnation of the Ukrainian military for violation of the cease-fire,” Lysenko said through a translator. “So we do not exclude that they tried to provoke the Ukrainian military to fire.”

Earlier Saturday, the mayor’s office in Donetsk said there had been no reports of shooting or shelling there although some shelling had been heard late Friday afternoon.

Ukraine, Russia and the Kremlin-backed separatists signed the cease-fire deal Friday in Minsk, the Belarusian capital, in an effort to end more than four months of fighting in the region. The negotiators also agreed on the withdrawal of all heavy weaponry, the release of all prisoners and the delivery of humanitarian aid to devastated cities in eastern Ukraine.

If the ceasefire holds, it would be a landmark achievement for both sides. Fighting between pro-Russian rebels and Ukrainian government troops has ravaged the already teetering Ukrainian economy, claimed at least 2,600 civilian lives and left hundreds of thousands homeless, according to United Nations estimates.