Geopolitical risk needs to move away from the ‘after-dinner speaker’: Eurasia Group and Rio Tinto’s Dominic Barton

Surprise U.S. tariffs. A war involving Iran. New American tech bans and Chinese export controls. The list of geopolitical shocks that CEOs must be mindful of, let alone plan for, keeps getting longer.

“We’re in a world where all the assumptions about international institutions, free trade, a rules-based order—that’s all going away,” said Dominic Barton, strategic counselor to Eurasia Group and chair of Australian mining giant Rio Tinto.

Barton spoke with Fortune days after U.S. President Donald Trump imposed 50% tariffs on some Canadian goods including autos, dairy, and alcohol. The president had also threatened tariffs in response to wildfire smoke drifting across the border. “Fifteen years ago, there would have probably been diplomats bringing this forward,” he said. “Now it’s just tweeted.”

(Just to show how changeable things are, on Aug. 19 Trump announced—on social media—that he will delay the new Canada tariffs by three days as the two countries near a deal).