Waking up in the morning, opening the newspaper, a headline leaped out: America has 1,550 nuclear weapons. So does Russia. China has less but it’s catching up – and China just got 25 tons of enriched uranium from Russia. Which the Pentagon says means China and Russia could end up with combined nuclear arsenals that dwarf ours.

We’ve never faced two nuclear superpowers before and there’s no turning back the clock. It’s a new era.