The Western media earlier quoted Yevgeny Limarev as saying that Honor and Dignity, a foundation of veterans of Russia's intelligence and diplomatic services, might have been involved in the November 23 death by radiation poisoning of Litvinenko, who defected from Russia in 2000 and was known as an outspoken Kremlin opponent.
A spokesman for the foundation dismissed the allegations last week.
"That is groundless, unsubstantiated information," he said, adding that the group is considering a lawsuit against the media outlets that made the allegations.
Limarev told the Ekho Moskvy radio station that the documents, which Mario Scaramella, an Italian security consultant, handed to Litvinenko during their meeting November 1, the presumed date of his poisoning, contained no information which could have led to the elimination of the Russian defector.
He said the documents concerned Scaramella himself and the head of the Mitrokhin Commission, a parliamentary body set up by former Italian premier Silvio Berlusconi to investigate the activities of Soviet and post-Soviet spies in Italy.
Scaramella was admitted to hospital in late November after testing positive in tests for the radioactive isotope polonium-210, which killed Litvinenko.
But doctors said the level of radiation in Scaramella's body was not dangerous and discharged him.
