Iranian oil exports to China fell by approximately 200,000 barrels per day from March to April, according to industry consultants, likely due to a higher volume of competing Russian oil exports to Asia. China, the main destination of Iranian oil exports, began buying heavily discounted Russian oil at triple its previous rate, after Western countries imposed sanctions on Russia. Russian crude oil is usually cheaper to refine than Iranian crude. Approximately 20 Iranian tankers carrying nearly 40 million barrels of oil have been left anchored near Singapore searching for buyers, according to shipping data and estimates by the analytics company Kpler.