Gunfire was reported on the outskirts of Kreminna at 1am. If true it pushes Lyman even deeper behind the lines.
What seems to have happened is forces from Kreminna tried to push on Lyman to rescue those trapped at Lyman but were turned back and ran into Ukrainian forces near Kreminna at night time. The Ukrainians are generally far better equipped for nightfighting as well. The Russians do have some night vision gear, but due to corruption a lot of it ends up in the hands of American paintball players.