Profiteers are using this war as an excuse for raising prices. In most places there is no food shortage, but many may have a shortage of money necessary to purchase the same foodstuffs as in the past.
Just as the US has strategic oil reserves, it has food reserves. The USDA may have to stop paying farmers not to grow crops and pay them to grow food crops (by subsidizing fuel and fertilizer and transportation costs.
There will be more buy local pushes going on.