Ukraine exports 9% of the worlds wheat & 13% of the worlds corn. If Ukrainian crops are severely limited this year which looks to be the case will cause continued rise in commodity prices. Market price is $10.49/bushel for wheat today. Year ago today it was 7.26/bushel.
https://tradingeconomics.com/commodity/wheat
Rising wheat prices means a transfer of wealth to Russia and Putin. If Putin demands rubles for wheat what are countries going to say, "Fuck you, we would rather starve."?