Ukrainian soldiers walks at the line of separation from pro-Russian rebels near Katerinivka, Donetsk region, Ukraine, Tuesday, Dec 7, 2021. Ukrainian authorities on Tuesday charged that Russia is sending tanks and snipers to the line of contact in war-torn eastern Ukraine to "provoke return fire," an accusation that comes amid fears that a Russian troop buildup near the Ukrainian border might indicate plans for an invasion. (AP Photo/Andriy Dubchak)