MOSCOW, May 30 - RAPSI. The Russian Prosecutor General's Office has expressed bewilderment that the high-profile case of former KGB agent Alexander Litvinenko was submitted to court before the investigation was completed and the guilty parties identified.

"For reasons unclear to us, Litvinenko's case was submitted to a London court before the investigation was completed and the guilty parties established. This is unheard of in any country of the world," Saak Karapetyan, the representative of the Prosecutor General's Office said in an interview with newspaper Rossiyskaya Gazeta.

Alexander Litvinenko, former KGB agent, fled to the UK in 2000. He died as a result of polonium-210 poisoning in London in November 2006. UK officials claimed that they had sufficient evidence to charge Russian lawmaker Andrei Lugovoy with murdering the former intelligence agent.

The official report on Litvinenko's death was never made public. It has been reported that, despite requests, Russia has not been able to see the medical report.

Lugovoy claimed the charges against him were politically motivated. He has passed a polygraph test administered in Moscow by British experts. No evidence of his guilt was found.

Former KGB officer Dmitry Kovtun has also been accused by the UK authorities of involvement in Litvinenko's mysterious death.

Kovtun previously confirmed that Russian prosecutors received a letter from the Crown Prosecution Service requesting his extradition to face trial. He believes the request was made under pressure from Litvinenko's wife, who is backed by self-exiled Russian oligarch Boris Berezovsky.

Kovtun has stated his willingness to testify in the case by means of videoconference.