It's a wonderful thing, first of all. Drinking with someone you don't like is like drinking with someone you do like, only there's the added pleasure of hope. You might end up getting along better. You probably will. You might end up liking them less, of course. But at least you know where you stand.
There's the Come-to-Jesus drink. (I don't like you and here's why.) There's the Ignore-the-Obvious drink. (Great to see you!) There's the Machiavellian Snuggle. (I don't like you, but screw it: We need each other.) Whatever the circumstances, drinking with an adversary is an act of diplomacy. What you're having is a summit meeting, and the bar is Reykjavíc.