The court found that "there was also a strong prima facie case that, in killing Mr Litvinenko, Mr Lugovoi and Mr Kovtun had been acting on the direction or control of the Russian authorities". Kremlin rejects the ruling.
Dissent has been systematically squashed out leaving a trail of dead opposition figures, critics and journalists for decades.
Litvinenko, a former agent with Russia's FSB, was granted asylum in Britain, but he died of radiation poisoning in 2006 aged 43, three weeks after drinking tea laced with radioactive polonium at an upmarket London hotel.
British media and politicians are accusing Downing Street of sitting on a 50-page document highlighting Russia's interference in British politics until after Britain's December 12 election is over.
Moscow ups ante, warns of reprisals if UK announces sanctions over the poisoning of a former double agent Sergei Skripal and his daughter Yulia on May 4. Russia also says it will bar all British media if UK banned RT broadcaster.
Prime Minister Theresa May said it is "highly likely" that Moscow was responsible for the poisoning of former Russian double agent Sergei Skripal and his daughter. Russia called May's statement a "circus show."
Sergei Skripal, once a colonel in Russia's GRU military intelligence service, and his 33-year-old daughter, Yulia, were found slumped unconscious on a bench outside a shopping centre in the southern English city of Salisbury on Sunday afternoon.
Sergei Skripal, once a colonel in Russia's GRU military intelligence service, was convicted in Russia of treason in 2006 but exchanged as part of a Cold War-style spy swap in 2010.
British Foreign Secretary Boris Johnson says the West needs to step up its pressure on Russia and the Syrian regime through sanctions.
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