Recurring pro-Kremlin disinformation narrative about the events in Vilnius on the 13th of January 1991, when the Soviet forces attempted to crush the re-established independence of Lithuania, killing 14 civilians. See previous disinformation cases here.
Lithuania proclaimed independence in March 1990. Moscow tried to foil the secession with an economic blockade. When that proved ineffective, Soviet troops still garrisoned in the capital Vilnius attacked its TV broadcast tower and sole TV station, killing civilians standing as human shields there. The events of the January 13th, 1991, and crimes committed by the USSR troops have been extensively documented. See also BBC reporting from 1991.
The disinformation case appeared in the context of the suggested amendments of Lithuanian intelligence law, according to which state security department could initiate preventive conversations with individuals, potentially targeted by foreign intelligence services. Read more here (in Lithuanian).