“How much grain do we get from the Ukraine? Any?”
It does not matter a whit.
Grain, like oil is a worldwide commodity and traded on international markets.
Whatever a bushel costs in Somalia, it costs the same in Chicago.
So Price will allocate and ration it. In many countries governments will intervene to subsidize. And the US government will purchase $billions$ to ship overseas to poor countries everywhere...further driving up the price as demand will remain constant.
But you will pay full price.
Thereby the American consumer will subsidize the cost of food worldwide and a loaf of Wonder Bread will be $6m, a dozen eggs $7. Same for a gallon of milk.
Plant every square inch of your yard. And include calorie dense staples...beans...potatoes...etc.
Because the biscuits and tortillas won’t be cheap. And a basic chicken could be as high as $12.
I’ve heard that US will have a shortage of sunflower seed oil but will be able to substitute other oils. Grain prices may be the same on the market, but by the time you add transportation costs and then move from wholesale price through the consumer conduits prices rise considerably. At least this is the case in the US where wages and profits are high. Years ago I saw an analysis of meat prices which showed only a modest fraction of the price we pay ever goes back to the farmer.