The Ukraine war remains the most important geopolitical conflict in the world, says bestselling author and historian Yuval Noah Harari.

In a wide-ranging conversation with Ian Bremmer filmed live at the 92nd Street Y in New York City, Harari says that if Russia wins in Ukraine, the global order as we’ve known it for decades is over. "The most fundamental rule was that you cannot just invade and conquer another country just because you're stronger. This is exactly what Putin is trying to do in Ukraine."