Two years ago this weekend, Russia invaded Ukraine. Two weeks ago, Donald Trump admitted that he would encourage Russia to ‘do whatever the hell they want’ to the US’s Nato allies, if they did not meet Trump’s demand to ‘pay their fair share’ of Nato funding. He also compared himself to the Russian opposition leader Alexei Navalny when discussing one of his many legal woes. All the while, the military aid package passed by the Senate last week, which includes $60bn for Ukraine, has stalled in the House of Representatives. So how worried should the US’s allies be about a second Trump presidency? What happens if the Republican party’s isolationist streak becomes the policy of the entire US? And in the meantime, how can Biden protect Ukraine when Congress refuses to act? Jonathan Freedland discusses these questions with Susan Glasser of The New Yorker