I don't know what you find hard to believe in the idea that an ex-KGB man who has been an autocratic illiberal leader for over 20 years now, might just be quite manipulative and duplicitous in his diplomatic communications.
Do you think the guys in Langley haven't known exactly what he is about all along?
Of course Khodorkovsky knew as well but now it's best for him to say he was played and is a victim.