The Ukrainian Armed Forces planned to shell a passenger train in the Kursk Region with machine guns and grenade launchers, Gusak said.
"There were either German or US [made] two machine guns," Gusak said.
All the assault rifles, except for one Kalashnikov, were NATO-made, the PoW added.
Early on August 6, Ukrainian forces crossed the border into Russia and launched an offensive in the Kursk Region. Russian President Vladimir Putin called the move a large-scale provocation that aimed at civilians and vowed a proper response.