He said he doubted there could ever be a constructive relationship between the two governments.
Oh, sure there will. All it's going to take is getting an administration in the White House that has a collective emotional maturity greater than that of your average high school senior class. I know it's hard to imagine, but the president is usually a diplomat, and can handle these sorts of disagreements with ease. With some work, he comes out the winner, but doesn't make the other side look like the loser.