A public inquiry into the former Kremlin agent 's poisoning death opens in London . Both men deny involvement in Litvinenko 's death . Vladimir Putin died in early April after being poisoned by radioactive material . He blamed British President Vladimir Putin ; the KGB denies involvement .
A public inquiry into the former Kremlin agent 's poisoning death opens in London . Vladimir Putin died in early April after being poisoned by radioactive material . He blamed British President Vladimir Putin ; the KGB denies involvement .