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Think about it -- Yukos Oil, run by a CEO whose head of security assassinates the corporate opposition.
Read up on these "dissidents" please:
http://news.bbc.co.uk/2/hi/business/4393003.stm
The kind of people who would run their oil business like this would have no compunction about murdering Politkovskaya and Litvinenko if it served their interests.
Look up Politkovskaya's book on Amazon.com. She doesn't seem to have been a serious journalist. Her book makes her look more like Russia's answer to Ann Coulter.
It doesn't make sense that Putin would bother to assassinate someone who was already regarded as a crackpot by the mainstream.
By the way, as was revealed in that movie on HBO about those two American conservative political consultants who (in real life) worked to help Yeltsin get reelected, there were many American conservatives who bought shares of Yukos Oil.
That could explain why the commentators at Fox News took Khodorkovsky's side during his trial, and didn't focus on Pighugin's murder convictions at all.
Watch that HBO movie and you'll see those two conservatives knew perfectly well that they were dealing with organized crime.