Stephen Hubbard, 72, was detained in eastern Ukraine in April 2022 and accused of fighting for Ukraine.
A Russian court has jailed a United States citizen for six years and 10 months after convicting him in a closed-door trial of fighting for Ukraine as a mercenary.
Investigators said Stephen Hubbard, who is originally from the US state of Michigan, was paid $1,000 a month to serve in a Ukrainian territorial defence unit in the eastern city of Izyum, where he had been living since 2014.
They alleged the 72-year-old signed up in February 2022, just before Russia launched its full-scale invasion, and was provided with training, weapons and ammunition.
Hubbard was detained by Russian soldiers two months later.