Colin Cramphorn, a policeman who served with distinction in Northern Ireland among many other places, observed that while every location is different, all are nonetheless connected. He realised not only that local knowledge is critical, but that the fate of one location often depends on the destiny of another. This insight was almost John Donnesque, akin to his observation that “no man is an island”. It is a key insight for our security: no problem can be viewed in isolation.

Yes, that’s how Gen. David Petraeus begins a speech to a London audience.

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