The impact of Russia’s invasion of Ukraine is already rippling through China’s economic and political system. One notable effect: A new threat to the country’s food security. Ukraine, sometimes referred to as the world’s bread basket, is a top supplier of corn and barley to China.  For Beijing, the current situation is further proof of the risks in relying on foreign countries to feed its enormous population, following on from the U.S.-China trade war and the hit to its imports o