MOSCOW (Sputnik) — According to the official, the officer was arrested in 2014 while the sentencing took place on April 26, 2016.
"A military district court in Warsaw has sentenced Lt. Col. Zbignev Y. to six years in prison for spying for Russia," the official told the PAP news agency.
According to unofficial reports, the convict allegedly passed to Moscow classified lists of Polish soldiers, who could have been targeted by Russian recruiters.