Anyway, to the point: this wasn't simply an assassination. There are any number of poisons out there that would do the job painfully well but much more rapidly, and without the same scope for a diplomatic incident. Likewise, a bullet to the back of the head would have worked just as well (as witness the assassination of Anna Politkovskaya).
What this is, is a warning: "we have the capability to detonate a dirty bomb in central London any time we feel like it, so don't fuck with us". (Just take Polonium and add a little TNT.)
Given that Litvinenko was promoting a book that asserted FSB agents blew up two apartment buildings in Moscow and pointed the finger at Chechen rebels in order to justify Putin's subsequent war on Chechnya, one possibility that must be considered is that elements of the FSB may be responsible — and willing to use radiological terrorism as a tool of foreign affairs. It may well not have been ordered by the Kremlin: all it takes is for Vladimir Putin to mutter "will nobody rid me of this turbulent priest?" over his breakfast one morning, and Shit Happens in a foreign capital thousands of kilometres away. (Or it may be entirely deliberate, merely "plausibly deniable", to use the charming CIA-surplus weasel words for "we did it but you can't prove it".)
And what disturbs me most is that all the other possibilities I've been able to think of are worse ...And as a bonus, here is Charlie's analysis of the Iraq débâcle
Despite all that, despite the Abu Ghraib photographs and the evidence of mass murder of civilians by soldiers, and a thousand daily petty atrocities, it's not immediately obvious that bringing the troops home won't make everything a whole lot worse in the long run, up to a worst-case scenario in which the "failed state" of Iraq turns out to be not so much a "failed state" as a voracious cancer of social breakdown that spreads inexorably to its neighbours, until the entire region is effectively government-free. "Government-free" does not mean some libertarian pipe-dream of a night watchman state and respect for individual liberty: it means that eventually the whole region will come to resemble Afghanistan under the Taliban, with authority — any authority — welcomed as an antidote to blood feud and starvation.
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