Paleckis has requested that the verdict be be annulled, while prosecutors deem it legitimate and well-grounded.
The Supreme Court's ruling in the case, announced on Tuesday, is final and not subject to appeals.
Under a ruling handed down by a Vilnius court on June 12 last year, Paleckis was imposed a fine of 10,400 litas (EUR 3,015). He was convicted for denying Soviet aggression following his statement to the media in 2010 when he said in comment of the Soviet Union's attempts to overthrow the then Lithuania's government in early 1991 that "our own people were shooting at our own people."
This was the first verdict in Lithuania's history on charges of denying aggressive conduct of the Soviet Union.
Fourteen unarmed civilians were killed and more than 1,000 were injured during attempts of the Soviet army and special units to take over the Television Tower and the building of Lithuania's National Radio and Television on January 13, 1991. Soviet soldiers did not attempt to attack the Supreme Council that had proclaimed Lithuania's independence on March 11, 1990.