Over the past two years, consumers have felt whiplash from volatile grain prices, as powerful players in the global markets cut off trade. It began with Russia’s attack on Ukraine, which disrupted exports of products including wheat and fertilizer from two of the world’s biggest suppliers. Russia has repeatedly used agriculture as a pawn in its game to punish Ukraine and its supporters, and its recent pull-out of the Black Sea grain deal, which had helped keep exports flowing, caused another round of price spikes in the markets.