No Ukrainian soldiers have been killed in the past 24 hours, he added. One Ukrainian soldier was wounded in Maryinka, and another one was hurt as a result of an explosion in the village of Syze, in the Stanytsia Luhanska district of Luhansk region, he said. Tensions have further escalated in the conflict area over the past 24 hours, including more intense shelling in the Donetsk region and near the city of Mariupol, he said. "The adversary has occasionally used heavy weapons, including mortars and infantry fighting vehicles," Lysenko said. The ceasefire has been observed in Luhansk region, he added.