Alexander Bastrykin, who heads the investigative committee at the General Prosecutor's Office said Tuesday, "We have not received any evidence from London of Lugovoi's guilt, and those documents we have are full of blank spaces and contradictions."
A representative from the U.K. Crown Prosecution Service said they never provide the actual documentary evidence as it was standard practice to send a summary, adding that they had followed all guidelines in the European convention on extradition.
Earlier businessman Lugovoi in a live press link with British journalists was critical of the investigation accusing the U.K. of having no proof of his involvement in the murder.
"Everything that the Crown Prosecution Service says is a lie, inspired by the British top leadership together with the special services," adding that he believed that Boris Berezovsky was behind Litvinenko's murder as well as other high-profile killings.
Litvinenko, an outspoken Kremlin critic, is believed to have died of poisoning from a dose of a highly toxic polonium isotope allegedly dropped into his drink in the bar of a luxury London hotel last November. Lugovoi reportedly met with him at the hotel on the day of his poisoning.
Moscow refused in early July to extradite Lugovoi, sparking a diplomatic dispute with London and unleashing tit-for-tat expulsions of diplomats and visa restrictions.
