What will be interesting to watch is how it affects food prices in countries that didn't import grain from Ukraine in the first place (like the US). I'm guessing there will still be a significant effect.
Wheat prices were up 77¢ according to a friend looking at fields that haven't been contracted yet. That's just this morning. Don't know if they continued to rise or if they plateaued, but that's what the response was in the Midwest.
The US is literally a world away with huge resources of their own.
It's North Africa and Arabia that are going to bear the brunt of it, and Europe too to a lesser extent (they at least have more access to the Atlantic).
Just like the last time there was a forced blockade of grain exports from Ukraine, worldwide wheat supplies were re-routed to underserved markets, making everyones' bread and wheat products worldwide spike in price.
With the insane rate of increases in food prices lately, not just caused by this war, but also through cascading climate events, it was already very likely that there will be famine in at least some parts of the world. This only further exacerbates what is already a fragile situation globally. We may very well see significant global unrest and possible regime changes across the globe.
From what I can find, the only current famines are in Madagascar and Ethiopia. Hunger is different from famine. Hunger caused by greed, not lack of food, does not qualify.