Germany's Federal Court of Justice has now upheld the conviction of the man, who lived in the Czech Republic. Prosecutors accused the man of hiring a vehicle used to drive the former chairman of PetroVietnam's construction arm, Trinh Xuan Thanh, and a woman accompanying him out of Germany.
Authorities say the pair were snatched off the street in Berlin in 2017 by Vietnamese intelligence officials and other employees at the country's embassy. Berlin accused Vietnam of breaking international law and kicked out the country's intelligence attache.
Thanh was taken to Vietnam, where he was sentenced to life in prison for corruption.