Pole suspected of spying for Russia detained

A Polish citizen, detained by Polish security agency on suspicion of spying for Russia, has pleaded guilty to the charge.

"The Internal Security Agency (ABW) has detained a Polish citizen cooperating with Russia's special services," ABW's spokesman Stanislaw Zaryn said on Monday.

"The suspect, who has been passing classified military documents to Russia, has pleaded guilty," Zaryn added.

"On May 5, ABW agents detained a 43-year-old man on espionage charges," reads a communique issued by a spokesperson for the minister coordinator of special services.

According to the communique, the materials handed over to Russian special services "have been extremely important for Russian operations on the territory and to the detriment of the Republic of Poland."

An investigation is under way.