Tehran exported a total of "$15.7 billion worth of oil in the first four months in the Iranian calendar" year, which lasted from March 21 to July 22, Mohammad Rezvanifar, the head of Iran’s Customs Administration, said on Monday. Most of this crude oil was offloaded in China, Turkey, the United Arab Emirates, Germany, and India, according to the country’s state-controlled press.

Iran’s illicit oil trade, which is heavily sanctioned by the United States and other Western nations, has hit a boom period under the Biden-Harris administration, topping around $90 billion as of March. This cash has helped to keep the hardline regime afloat amid economic uncertainty and helps Tehran fund its network of terror proxies, including Hamas and Hezbollah.

China has long been Iran’s top oil client, with exports routinely crossing 1 million barrels per day. While sanctions are in place to stop this trade, the Biden-Harris administration has come under fire for turning a blind eye to Tehran’s oil exports as part of a bid to ease diplomatic tensions with the hardline regime.