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Reporter: while in london we had a hastily arranged meeting with another man who's convinced his life is in danger. akhmed zakayev is a wanted man in russia, a rebel leader from the breakaway chechen republic,. ahm and a close friend of the former kgb agent alexander litvinenko, who he says gave him an important piece of advice, never trust old friends. >> he said, someone will come from your past, but you shouldn't trust him because he will be your killer. >> sasha told you that? >> sasha told me -- >> beware of someone coming from your past. >> beware of someone coming from your past. >> whi...

Contact of his just a few months before joyal was shot. >> he was a law enforcement officer. >> reporter: he worked for the equivalent of the fbi. >> yeah, i mean -- >> reporter: in anti-corruption? >> anti-corruption was what really he was most interested in. >> reporter: his name was alexander litvinenko, sasha to his friends. but his interest in fighting corruption had made him a lot of enemies, including in his own agency, the kgb, which was renamed the fsb. litvinenko was forced to flee russia with his wife and son, and seek asylum in london, where he quickly caught the attention of agent...

>> first of all, i like your name for our special better than our name. put putin it to putin, i like that a lot. what was surprising this time was just how kind he was when the cameras weren't rolling. you know, like a gentleman. and he can appear extremely polite, thoughtful. he offered us a grand tour of the grand kremlin which we took and took our cameras there too so the audience will see that to know. a charmer is how he wishes to be -- to project. what you see in putin is what he wants you to see. then you get him in front of the cameras and he's this fiery combative leader we have seen...

Your current or potential partner with respect. otherwise, nothing will come of it. i think this is a purely pragmatic approach firstly. secondly, despite the fact that he's a first-time president, still he's a quick study after all. and he understands very well that this level where we are engaging in mutual accusation and insults, this is a road to nowhere. and if you have noticed, i always treat my colleagues not only in the united states but in europe and in asia with unwavering respect. >> meghan, thank you for joining us. great get as we say in the business. i like to ask the same questi...

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