Litvinenko died on November 23 after being poisoned with polonium-210.
British media reports describe Andrei Lugovoi -- a former KGB bodyguard -- as a prime suspect in the case.
Lugovoi denies involvement.
He told Ekho Moskvy radio that due to the negative media attention in Britain he does not believe he can get a fair hearing there.
Lugovoi also said he planned to ask British authorities for information about the investigation and about his status.
Lugovoi said when British authorities questioned him in December they told him he was a witness, not a suspect.
Litvinenko, a harsh critic of the Kremlin, issued a deathbed statement accusing Russian President Vladimir Putin of ordering his murder. The Kremlin denies the allegation.
Aleksandr Litvinenko: A Timeline
CLOAK AND DAGGER: A timeline of a murder case that unraveled after Andrei Litvinenko, a former Russian security officer and vocal Kremlin critic, dies on November 23, 2006, of poisoning by radioactive isotope polonium-210.
In a deathbed letter, Litvinenko blames Russian President Vladimir Putin for his death -- a claim Putin condemns.
Investigators center on two meetings in London that Litvinenko had described -- one in which he met with two Russians for tea in London, and another in which he met with a third Russian at a sushi bar.
Six months later, British prosecutors announce they have enough evidence to charge a Russian citizen -- one of the men who had met with Litvinenko for tea -- with the murder ...more...
MORE: Coverage in Russian from RFE/RL's Russian Service.