The Belarusian ruler’s price controls have backfired. Alexander Lukashenko’s stubborn grip on the Belarusian economy plunged the potato-happy country into a spud shortage this spring. Critics of the authoritarian ruler, who in January grabbed a seventh term in power, say he has warped the economy with strict price controls on staples like potatoes — while encouraging citizens to snitch on grocery stores that flout regime rules. The limits, launched by Lukashenko in October 2022 as he aimed to keep prices low and stave off inflation, instead made potatoes far less profitable for farmers to produce. Opponents say that decisions made...