"Thanks; very interesting. I suspect part of this relates to Boris Berezovsky being exiled in London, though that's probably not the whole story"
I have a feeling that Russia regularly ruins those who she has used to do business with the West. Notice how they promote so many Jews to the level of oligarch. That way when it's time to lock them up and throw away the key (for doing business with the West) no one will complain.
Makes perfect sense. :) Also Chechen rebels the most likely are Putin's agents - he tells them to commit terrorist act in order to justify fighting against them.