Munk Dialogue with Andrew Coyne: how do you negotiate with Donald Trump?

Mark Carney is learning quickly - as the digital services tax debacle proved - that attempting good faith negotiations with the US President does guarantee a positive or lasting agreement. What is the point of making concessions of any kind when the goal posts keep moving? Rudyard and Andrew then turn to America's decision to pause weapon shipments to Ukraine on the heels of easing sanctions against Russia. Andrew believes that Trump has done everything in his power to enhance the Russian position while weakening Ukraine's, thus sending an important message to the world's democracies that American support is not guaranteed. Can Mark Carney's spending commitment to build up Canada's defense protect our borders in an increasingly hostile world dominated by strongmen? And perhaps most importantly, how will we find the money to pay for this?