Bruce, what you tell us is what already scares me regarding wheat. Ukraine production for 2022 can only be a small percentage of what is was in 2021, and if what I read is right, they provide around 30% of the international sales.
It is now probably too late to increase the production in other countries, and even if a farmer would want to produce potatoes instead, I can't imagine that he would find the required potatoes to put into the ground. At least where I work, I'm happy when I can get what I ordered.
I guess that cows and sheeps farmers have the advantage that they can easier limit the size of the herd to the capacity of the farm, but that again will make a lot of meat right now and not much next year.
Added: my only hope is that, if we eat the barley, soja and corn directly instead of feeding the animals, there might be enough for everyone. But my kids won't like it.
Added2: the article on the link talks about Spain and Italy, but I buy mostly Portuguese ham because it is about 30% cheaper with a similar quality, and because I hope their pigs haven't been days in a truck before culling. I wonder how they can manage the situation.