Moscow will not extradite possible suspects in the poisoning of former KGB agent Alexander Litvinenko to Britain, Russia's top prosecutor announced yesterday. Yuri Chaika also warned that visiting British detectives would only be allowed to listen as their Russian counterparts collect testimony. He said that under Russian law, a Russian citizen who is accused of committing a crime abroad must face trial at home. Chaika said that his office would fully co-operate with a team of British investigators and added that those interrogated would be questioned by Russian prosecutors in the presence of the British officers. Chaika also confirmed that a potential central figure in the case, another former Russian agent who met with Litvinenko in London on 1 November - the day Litvinenko believed he was poisoned - is currently being treated in hospital.