He and 66 other Soviet-era officials were on trial for the violence that left 14 people dead and hundreds injured when Soviet troops stormed a television tower and an adjacent building in Vilnius on Jan. 13, 1991.
The defendants were citizens of Russia, Belarus, and Ukraine.
The trial began in 2016. Only two defendants were present in court with most of the others being in Russia, which has refused to hand them over. Those present have pleaded not guilty.
The verdict comes at a time of growing military activity in the Baltic Sea region, with several reports of alleged airspace violations by Russian military aircraft and an increased presence of Russian military vessels.
The assault on the television facilities was the deadliest Soviet action to crush secessionist movements in the Baltics.
There was no immediate reaction from Moscow.
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