Russian state 'involved' in ex-KGB agent's London murder, inquiry hears

The Russian state must have been involved in the 2006 poisoning of ex-KGB agent Alexander Litvinenko with a radioactive isotope, which amounted to "a nuclear attack on the streets" of London, an inquiry into the death was told on July 30.

Kremlin critic Litvinenko died weeks after drinking green tea laced with polonium-210 at London's plush Millennium hotel. From his deathbed he accused Russian President Vladimir Putin of ordering his killing but the Kremlin has always denied any role. 

"The evidence suggests that the only credible explanation is that in one form or another the Russian state was involved in Litvinenko's murder," Richard Horwell, the lawyer acting for London police, said in closing remarks to the British inquiry. 

The controversy generated by Litvinenko's killing plunged Anglo-Russian relations to a post-Cold War low, and the inquiry chairman has already said there was prima facie evidence of Russian culpability. 

Britain has accused Russians Dmitry Kovtun and Andrei Lugovoy, also a former KGB agent but now a lawmaker, of actually carrying out the poisoning, but they deny any involvement and Russia has refused to extradite them. 

The inquiry has been told traces of polonium were found across London where the two men had been, including offices, hotels, planes and even the soccer stadium of Arsenal. 

"No matter how many state honours Putin may pin to Lugovoy's chest for services to the mother ... or how many times Kovtun promises to blow apart this inquiry, Lugovoy and Kovtun have no credible answer to the scientific evidence and the trail of polonium they left behind," Horwell said. 

Neither had any personal motive and were "common murderers", he added. 

But the Russian state...