One Ukrainian soldier was killed and another three were wounded in Donbas over the past day, the Ukrainian Presidential Administration's spokesman for Anti-Terrorist Operation (ATO) issues Andriy Lysenko has said.That happened in a mortar attack on the Avdiyivka industrial zone," he told a press briefing in Kyiv on May 23.The Luhansk sector has seen four enemy attacks, Lysenko said. In particular, militants shelled the villages of Zhovte and Solilnyky, the village of Novozvanivka came under enemy sniper fire twice.The enemy used 82mm mortars.