In 1989, Francis Fukuyama, then a very young political scientist, declared that history was over. He wrote a book with the same title just a couple of years later. The Cold War had finished, the USSR had collapsed, liberal democracy and market capitalism reigned supreme, and it wasn’t going to change. And yet in the last few years, the script has moved quite significantly. History has returned. Emblematic of that has been the conflict between Russia and Ukraine which began in 2022, although of course, you can date that back to 2014 when Russia annexed Crimea.

On Downstream this week is Serhii Plokhy, professor of Ukrainian history at Harvard University. He offers a deep history of Russia and Ukraine, the conflict, where it comes from, and where it sits within the broader sweep of collapsing empires. He’s also got a new book out, about nuclear weapons and nuclear energy: The Nuclear Age. They discuss what is driving Vladimir Putin’s war on Ukraine, almost four years after it began. What does Putin’s stated aim of ‘de-Nazification’ really mean? What role does Russia’s nuclear arsenal play in determining the shape of the conflict? And, in an increasingly multipolar world where history has indeed come back, is nuclear proliferation within the next ten years likely?