Litvinenko, a Kremlin critic who had been granted British
citizenship, died days after he was poisoned with polonium-210,
a highly toxic radioactive isotope, which was slipped to him in
a cup of tea at a plush London hotel.
On his death bed he accused Russian spies of ordering his
killing, and British police and prosecutors say there is
evidence to charge two former KGB agents Andrei Lugovoy and
Dmitry Kovtun with his murder.
The two deny the accusations and Russia has refused to