Slovenia's state security agencies have arrested two men suspected of spying for the Russian military intelligence service, the Ljubljana-based Delo newspaper reported on Monday, citing sources.

The suspects, one of whom has citizenship of a South American country, operating under assumed identities from a rented office in the Ljubljana neighbourhood of Bezigrad, the report said.

The two suspects have been charged with espionage and using false documents. If convicted, they may face jail terms of up to eight years, the report said.

Slovenia's intelligence agency did not immediately respond to a request to comment on the report when contacted by Reuters.