The United States has imposed a fresh round of sanctions targeting individuals and companies accused of channelling Iranian crude oil to China, a move that sharpens economic pressure on Tehran days before President Donald Trump is due to meet his Chinese counterpart, Xi Jinping, in Beijing. The Treasury Department announced on Monday that it had blacklisted three people and nine entities, including four firms based in Hong Kong, four in the United Arab Emirates and one in Oman, alleging they facilitated oil sales on behalf of the Islamic Revolutionary Guard Corps. The designation forms part of the administration’s “maximum pressure” campaign, which Washington insists is intended to starve Iran’s military and nuclear programmes of revenue while cutting off funding for armed proxies across the Middle East.

Viewed from Washington, the timing is deliberate. The sanctions land less than a week after separate US measures against networks supplying drone and missile components to Tehran, and just before a summit where the White House expects Mr Trump to press Mr Xi on China’s role as a buyer of Iranian oil and its broader posture toward the crisis in the Strait of Hormuz. The president has already described Iran’s latest ceasefire proposal — which reportedly demanded war reparations, the lifting of all sanctions and recognition of Iranian sovereignty over the strait — as “garbage”. Analysts in London note that the punitive measures are also coordinated with the United Kingdom, which simultaneously announced its own sanctions targeting Iranian-linked shadow banking networks and individuals accused of financing destabilising operations.

From Tehran’s perspective, the intensifying financial siege underscores the failure of diplomatic overtures. Iranian state media had framed the recent proposal as a basis for negotiation, but the US rejection and the new sanctions suggest that Washington sees little room for compromise. The Islamic Revolutionary Guard Corps, which the Treasury says relies on front companies in permissive jurisdictions to disguise its involvement in oil sales, remains the central target. In the Gulf, officials in the UAE and Oman now face the delicate task of policing their financial hubs without alienating either Washington or Beijing, while Hong Kong — a Chinese special administrative region — finds itself once again caught in the crossfire of great-power rivalry.

Looking ahead, the success of the sanctions will depend heavily on China’s willingness to enforce them. Intelligence reports cited by US media have indicated that Beijing is preparing to supply Iran with new air defence systems, and Chinese purchases of Iranian crude have been a crucial economic lifeline for the Islamic Republic. As Mr Trump prepares to sit down with Mr Xi, the oil trade is likely to dominate the agenda alongside a host of other commercial disputes. A failure to secure Chinese cooperation could further destabilise an already fragile ceasefire, leaving the Strait of Hormuz — through which a fifth of the world’s oil passes — exposed to renewed disruption. The coming days will reveal whether punitive diplomacy can shift the calculus in either capital.