MOSCOW, April 6 (RAPSI) – The trial of a Polish army officer, who stands charged with spying for Russian military intelligence (GRU), has begun in Warsaw, RIA Novosti reported on Wednesday.

Court proceedings against Lieutenant Colonel Zbigniew J. are being held in the District Court in Warsaw behind closed doors.

The officer is charged with disclosure of information that could cause damage to Poland. He faces up to 15 years in prison.

Details of the case have not been officially provided.

Zbigniew J., who served in one of Poland’s Defense Ministry’s departments, was arrested in October 2014 and has been held in detention ever since.  His arrest was made with the involvement of military police troops; materials collected by the Military Counterintelligence Service became grounds for the arrest.