Donald Trump has never tried to reach out to all the American people, he never uses the language of unity, he doesn't try to charm or persuade. He just says, thanks to the people who voted for me and the rest of you are losers.

Trump has learned how to function in a world in which people now live in very separate realities, where they get their news from Facebook recommendations and believe in a particular set of facts. Others, who live in a different reality, know quite a different set of facts.

If Putin decides to run, which we are assuming that he will, there really isn't anything that can stop him. He can manipulate the system so that he has not real opponents; he can manipulate the media so that nobody else gets any coverage. And then, if worse comes to worse, he can - as he has done in the past - just change the electoral results. So, it's not like it's going to be a very exciting election.

Donald Trump has never tried to reach out to all the American people, he never uses the language of unity, he doesn't try to charm or persuade. He just says, thanks to the people who voted for me and the rest of you are losers.

I don't want to predict calamity. But I am afraid of a new Russian occupation of parts of Eastern Europe. Also of a new Russian campaign to exert influence in Germany or other parts Europe, aimed at making continental politics less democratic. I am afraid of a US trade war and even a shooting war with China.

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.

What's interesting about Navalny is that he has run a - not so much a pro-democracy campaign in Russia, but an anti-corruption campaign. He seems to have access to quite a lot of information about very senior Russians, including Putin.