Amazing how that one country alone is being relied on for wheat by several countries and that it not being able to export could cause unrest in these. Also starkly reminds us of how interconnected our countries has become that many are no longer able to feed themselves efficiently.
If does come to a no-more-wheat scenario, there's really no choice but to eat something else. When our country started having rice shortages a few decades ago, people ended up having to eat more sweet potato and cassava. So maybe less pita and more pilaf for the Middle Easterners, for example. Tortilla ain't that bad either.
Actually a lot of countries are bring relied on for various goods and Ukraine is one of the major exporter for wheat. And when one major exporter have been disrupted, other countries tend to be disrupted as well. However, this disruption will not last forever as government will search for alternative to import from.
Just like what happened with you when shortage happened on rice, but later on rice has been available but it came from other country instead and a price fluctuations due to changes on importer of rice.