Britain issued a new sanctions waiver on Tuesday allowing the import of certain diesel and jet fuel processed in third countries from Russian-origin oil, even as the United States separately tightened sanctions on networks it accused of supporting Hamas and helping Iran move oil and petrochemical revenue.

The UK Department for Business and Trade published General Trade License GBSAN0004, saying prohibitions under Britain’s Russia sanctions regulations will not apply to relevant processed oil products if they fall within specified diesel and jet fuel commodity codes. The license covers products processed in a third country from Russian-origin oil and oil products, and is due to take effect on May 20 for an indefinite period, subject to periodic review. 

The license does not lift the broader Russia sanctions regime and does not authorize conduct that would otherwise breach the regulations, the department said. On Monday, the U.S. Office of Foreign Assets Control (OFAC) extended a sanctions waiver first published in April, permitting the sale of some Russian seaborne oil and petroleum products. 

The UK move came the same day OFAC announced two separate sanctions actions. In one, the agency targeted four people allegedly linked to a Gaza-bound flotilla organized by the U.S.-designated Popular Conference for Palestinians Abroad, or PCPA, along with figures it said operate in Hamas-aligned Muslim Brotherhood networks. 

Treasury said the PCPA was established with funding from Hamas’s International Relations Bureau and that Hamas directs the group through officials embedded in its leadership. 

In a second action, Treasury said it designated more than 50 companies, individuals and vessels under its “Economic Fury” campaign against Iran. The action focused on Iran-based Ebrahimi and Associates Partnership Company, known as Amin Exchange, which Treasury said handled hundreds of millions of dollars in foreign transactions for sanctioned Iranian banks and petrochemical exporters. 

Treasury said Amin Exchange maintained front companies in the United Arab Emirates, Turkey, Hong Kong, and China to help move payments tied to Iranian petroleum, petrochemicals, metals, manufacturing, and automobile activity. 

OFAC also blocked 19 vessels allegedly involved in shipments of Iranian petroleum and petrochemicals to foreign customers. The vessels include tankers accused of carrying Iranian liquefied petroleum gas, naphtha, crude oil, methanol, and high-sulfur fuel oil since 2024 or 2025.