I posted the comment below at Done with Mirrors and no one noticed!
Realpolitik works only if the other side is playing it. If the other side is a bunch of millenarian madmen it's a really bad choice.
I would add that continuing to praise, or even fund, the UN is just about as stupid - the majority of nations involved in the UN aren't just out to lunch, they've already cut the waiter's throat and are now going through the till.
I SUPPOSE THE ONLY ANSWER IS TO SHOUT.