> But what is the threat? In 1940 the danger of a German invasion of the UK was very real. But the chances of Russian tanks rolling up Whitehall are surely negligible.
> "It's not the tanks you need to worry about," says historian Margaret MacMillan, author of War: How Conflict Shaped Us.
> "It's the cutting of cables on the ocean floor. It's the hacking into systems on which so many things depend. The possibility for asymmetric war, for cyber war, is growing by leaps and bounds."