Niall Ferguson: The global network has become dangerously unstable

The president of the United States tweets that his own intelligence agencies are illegally leaking classified information to The New York Times about his campaign's communications with the Russian government, but he insists that it's all "fake news." Meanwhile, having interfered in the US presidential election via WikiLeaks and an online army of trolls and bots , the Russians send their spy ship Viktor Leonov to have a snoop at the US submarine base at New London, Conn.