Arguing for breaking diplomatic relations with Russia, on the grounds that Putin does not want peace except on the basis of conquest, and his "negotiations" and "diplomacy" are all dishonest.

That's 90% true, but I am not convinced. Even though there is no hope that diplomacy will lead to an acceptable peace now, that may change in the coming year. We should be ready for that. In the mean time, there are other issues to be discussed, and some of them are important. The Ukraine food export deal, by itself, is no small thing for the poor people of the world.