On credibility, besides number of claims that FSB was preparing hit on Berezovsky (proved to be false, but highly benefitial to Berezovsky himself: in one case FSB management was toppled, in another Berezovsky was given asylum in the UK) here are a number of selected quotes:
On al-Zawahiri:
A. Litvinenko: Certainly, here it is. The number two person in the terrorist organization al Qaeda, who they are crediting with the series of explosions in London, Ayman al-Zawahiri, is an old agent of the FSB. Being sentenced to death in Egypt for terrorism and hunted by Interpol, Ayman al-Zawahiri, in 1998, was in the territory of Dagestan, where for half a year he received special training at one of the educational bases of the FSB. After this training he was transferred to Afghanistan, where he had never been before and where, following the recommendation of his Lubyanka chiefs, he at once ... penetrated the milieu of bin Laden and soon became his assistant in al Qaeda.
On 2005 London bombings:
The correspondent: What can you say concerning the acts of terrorism in London ? From what region and with what forces was this impact directed? A. Litvinenko: In reply to this question I can declare perfectly definitely, that the center of the global terrorism is not in Iraq , Iran , Afghanistan or the Chechen Republic . The terrorism infection creeps away worldwide from the cabinets of the Lubyanka Square and the Kremlin. And until the Russian special services are forbidden, dispersed and condemned, the terrorism will never stop: bombs will blow up, and blood will be shed. Terrorism has no limitation period and those, who were engaged in it, should be found and punished, until they are alive, instead of to award them with the Nobel Prize of the world and not to set up monuments for them.
A. Litvinenko: In reply to this question I can declare perfectly definitely, that the center of the global terrorism is not in Iraq , Iran , Afghanistan or the Chechen Republic . The terrorism infection creeps away worldwide from the cabinets of the Lubyanka Square and the Kremlin. And until the Russian special services are forbidden, dispersed and condemned, the terrorism will never stop: bombs will blow up, and blood will be shed. Terrorism has no limitation period and those, who were engaged in it, should be found and punished, until they are alive, instead of to award them with the Nobel Prize of the world and not to set up monuments for them.
On 1999 shooting in Armenian parliament:
Former Federal Security Service (FSB) agent Alexander Litvinenko said in various interviews that the Main Intelligence Directorate of the General-Staff of the Russian armed forces had organized the terrorist attack in the Armenian parliament.
On murder of Kadyrov:
But this is by no means the only theory. Contrary to Kommersant, Aleksandr Litvinenko, the former FSB lieutenant colonel and ally of fellow exile and Putin opponent Boris Berezovsky, argued that Ramzan Kadyrov, being Akhmad Kadyrov's son and head of his security service, must have known the Chechen president's schedule and movements on May 9. After the elder Kadyrov's murder, Ramzan, rather than immediately setting out to apprehend the assassins or even "crying for his father," flew to Moscow to "report to Putin," Litvinenko wrote.
The only rational explanation for all this is that Litvinenko was Berezovsky's faithful sidekick and was playing popular in Anglo-Saxon press angle of Putin=FSB=KGB. For Berezovsky Putin is Frankenstein who occupies his rightful place of top dog in Russia.
It's important to put up as much information as possible on the protaganists in this story so that one can make an informed opinion.
I am aware that my opinion of Guzzanti and Scaramella appears one-sided. I'm comforted by the fact that they have plenty of prominent supporters or shoddy reporters to shovel their shit for them.
On Scaramella, he is not known in Russia, but I've seen comments on Russian side that he was working in Moscow and had access to the same open KGB archives every foreigner can get access to.
On Litvinenko, one thing to understand is this context is that he was not in a position to confirm or deny anyone's involvement in former KGB's foreign operations. He have not even seen the same archives Scaramella saw, did not work in any kind of spy business, and Goldfarb clearly states that when he tried to run to the US, he had nothing to offer in terms of information in exchange for settlement of his immigration case. UK was willing to take him as is.
I simply wish to report the controversial aspects of the Berlusconi commissions which includes of course the roles of ex-KGB/ FSB members.
What I find interesting is that two important interviews carried out last year have now been published- perhaps too controversial at the time, but now pertinent to an understanding of the Berlusconi regime.