Censor.NET reports citing RFE/RL.
Stanilsau Hancharou was arrested in April on his arrival from Ukraine, where he fought in the far-right Azov Battalion against Russia-backed separatists in the eastern Donetsk region.
He and his co-defendants, men aged 18-22 whose names were not disclosed, were charged with inciting ethnic and racial hatred, theft, engaging minors in criminal activities, online pornography distribution, and hooliganism.
Their trial started on Dec. 12 in Vitsebsk in northeastern Belarus.
Hancharou, 20, has posted videos on the Internet that officials say propagate neo-Nazism. One appears to show him coercing young antifascists to reject their viewpoints and perform a Nazi greeting.
He has tattoos of a coded neo-Nazi greeting -- "88," which stands for "Heil Hitler" -- and a symbol of a World War II-era military unit of the Waffen-SS.