It’s GL 135 (Authorizing Transactions Related to the Sale, Delivery, Offloading, and Importation of Diesel Fuel of Russian Federation Origin):

Mr. Sanctions is going to be snarky here – I note that this GL includes importation into the US, and expires after the US General Election in less than 4 weeks. So, the domestic pain of high diesel prices and the knock-on effect on the prices of the goods that diesel trucks carry, outweighs the importance of denying Russia hard currency, especially US dollars?

Apparently so….