Unlike most European countries, the police in the US are decentralized; even the FBI has regional offices. Amending the constitution is a long and tedious process.

European security may now depend on Germany, France, Britain and one or two others, and it's better to start planning now for the possibility of European-only cyber-defense, counter-terrorism, and conventional defense too.

Steve Bannon, the White House chief strategist, appears to imagine an alliance between Trump, Le Pen, Geert Wilders and Nigel Farage. Call it the populist international, a fraternal association of the nationalist right, binding people who want borders, across borders.

The Soviet Union was, by the 1970s and 1980s, relatively stable and predictable. Putin's Russia is much more volatile. Nuclear policy is really in the hands of one person, or a small group of people, instead of a huge party-state apparatus. The possibility of a mistake is greater now.

Putin has made life difficult for a lot of Russia's richest men; they don't like the sanctions; they don't like the war with the West. Many of them have houses and families and businesses in the West, and so I can see them being unhappy. But at the moment, the political system is so constructed that it would be very difficult for them to leave. That's not saying it couldn't change.

A lot of the Russian economy is built around people who are one way or another milking the state and taking money from the state and recycling it into their private bank accounts. And there are a lot of people who are taking advantage of that, so it's not just one person. It's a kind of web of people doing that, and that's how the system stays in power and how people stay in control.

The nationalist right have common views. They hate the EU, they hate NATO, they dislike trade, they admire Russia. Many of them are funded by Putin.