DONETSK, Ukraine (AP) — Ukrainian officials said their forces advanced to the outskirts of a key town north of Donetsk on Saturday as they try to retake the stronghold held for months by pro-Russia rebels.

The move comes as Ukrainian forces appear to have gained some momentum recently by retaking control of territory from the rebels. But Russia also appears to becoming more involved in the fighting, with the U.S. and Ukraine accusing Moscow of moving heavily artillery across the border to the rebels.

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