Belhaj and Bouchar's lawyers believe the pair has a strong case, based in part on a secret intelligence file discovered by the New York-based NGO Human Rights Watch during the revolution that toppled Gaddafi.
Based in part on secret UK intelligence reports, it concluded that Putin had "probably approved" Litvinenko's murder, together with his spy chief, Nikolai Patrushev (then head of the FSB, the successor to the KGB).
Mr. Carrillo's investigation is based in part on secret police files opened to him by President Vicente Fox, who has said that no one -- not even ex-presidents -- would be held above the law.
Harding said Owen's shocking conclusion that Putin knew about and probably approved the murder of Litvinenko was based in large part on secret material presented to the enquiry by unnamed witnesses in closed sessions held last May.
He said the intelligence-led operation started in 1981 involving a team of undercover regional crime squad officers, including some from Yorkshire who were based in London for the secret inquiry.
Daniel Henry, a mine owner based in Hailey, said that the secret to those smooth rides is in the dirt.
But these are the allegations Vancouver actress Sarah Edmondson and others have levelled against the leaders of a secret society based in Albany, New York, and precisely the reasons they went along with it.
Documents leaked by Snowden last month said US spies based in the UK intercepted top-secret communications by Medvedev, then president and now prime minister, during his London visit in April 2009.
That, and his fluent German, earned him a place in a top-secret group based in newly liberated Versailles that visited the sites of RAF bombing raids to find out whether pilots' reports of the damage they had done matched reality.
The other was Colonel Rudolf Abel, a Soviet secret agent based in the US for 11 years, whose brief was to infiltrate the American nuclear weapons programme.
