The inquiry into Alexander Litvinenko's death has heard how suspect Andrei Lugovoi was in hospital for exposure to radioactive material when Scotland Yard officers questioned him in Moscow.
Detective Inspector Craig Mascall from the Metropolitan Police's counter-terrorism unit told the inquiry that British officers travelled to Moscow to interview Mr Lugovoi and fellow suspect Dmitri Kovtun in December 2006.
Mr Mascall confirmed that both men are accused of murder and would be arrested if they ever entered the UK.
The inquiry into Alexander Litvinenko's death has heard his statement on how he was poisoned. ITV News Correspondent Juliet Bremner reports.
Marina Litvinenko has told the inquiry into her husband's death about the days leading up to his poisoning.
The widow of poisoned spy Alexander Litvinenko told an inquiry into his death that he would not have acquired the materials that killed him.