As an element of scare tactics - "look what would happen to anyone who would try to defect to the other side. It doesn't matter where they might have fled the sacrosant retaliation will find them anywhere."
4. I also read that the guy was previously jailed for high treason in Russia (http://www.bbc.com/news/world-europe-43291394t), so why would they kill him now in the UK if they could have done it long ago and much more quietly in Russia?
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