Litvinenko was assassinated by Putin for working for MI6, and the assassination was very carefully planned to end up in London to send a very pointed message. He was tasked with "getting nuclear materials out of Russia". Well, he managed that all right...
The more you know.
Seriously: this is well known, look for Telegraph coverage, radiation on the plane ("in his tea" cover - yeah, nice one), Litvinenko's business network connections and so on. Is Putin a nice guy? Nope, but poisoning is his personal signature, and MI6 aren't exactly angels either.
I'm sure I'll pick up more "down votes" from the HN crowd, but hey: I thought you were all wise to info-bubbles?
p.s.
MI5 is the internal Security division for the UK; MI6 is the external Security division for the UK
Helps if you know the difference, and for that matter - it helps if know that the FSB is also the domestic Security division, so wouldn't be contacting MI6 anyhow.
Top marks all around for generally bullshitting there.
