By Joanna Lillis for Eurasianet Kazakhstan has long relied on black gold, or petroleum, to keep revenues flowing into its coffers, but now it is experiencing a mini yellow gold rush. Production and exports of sunflower oil have skyrocketed in Kazakhstan this year, as the world faces supply shortages and rising prices because of Russia’s invasion of Ukraine. Ukraine was the world’s largest supplier last year, exporting billions of dollars’ worth of sunflower oil. But the war has disrupted farming, production and shipping. A Russian kamikaze drone strike last week that ignited tanks of sunflower…