The Trump-Xi summit has commanded the headlines, but a quieter and arguably more consequential confrontation has been unfolding in parallel. For the first time, Beijing has deployed a formal legal instrument — a blocking order — to directly nullify U.S. sanctions against Chinese companies. The move raises a question with sweeping implications: has America's most effective economic weapon met its match?
What Washington Did, and Why Now
On April 24, the U.S. Treasury Department placed five privately owned Chinese oil refiners — including Hengli Petrochemical, part of the group known colloquially in China as "teapot refineries" for their small-to-mid-sized, independent character — on the Specially Designated Nationals and Blocked Persons (SDN) list. More than 40 shipping companies suspected of ferrying Iranian crude were sanctioned alongside them.
The SDN designation is the most severe tool in Washington's arsenal. It triggers comprehensive asset freezes, transaction bans, and the effective severing of international commercial relationships — consequences far more punishing than a standard Entity List designation.
The timing reflects a specific strategic calculation. The United States, seeking leverage in its ongoing effort to wind down entanglement in Iranian regional affairs, wants to squeeze Tehran's finances. China's independent refiners are the linchpin: between 80 and 90 percent of Iran's oil exports flow to Chinese buyers, making them the single largest source of hard currency sustaining the Iranian economy. Chinese teapot refineries have been purchasing that oil for years — the decision to act now, and act severely, signals that Washington is using economic coercion as a substitute for military pressure.
Beijing Responds With Law, Not Just Rhetoric
China's prior responses to U.S. sanctions on its companies were largely symmetrical and limited — adding a handful of American firms to its own restricted lists, or sanctioning a few U.S. executives in return. This time, Beijing's response is structurally different.
China invoked its 2021 Provisions on Blocking the Unjustified Extraterritorial Application of Foreign Legislation and Other Measures to issue a formal blocking order. The order explicitly prohibits any Chinese entity or individual from recognizing, enforcing, or complying with U.S. sanctions against the five targeted firms. Crucially, it goes further: any Chinese company or person that does comply with the U.S. measures — and causes financial harm to one of the five sanctioned firms as a result — faces domestic legal liability and potential compensation claims.
In practical terms, the Chinese state has interposed itself as a legal shield between the five companies and U.S. sanctions. Cutting business ties with the targeted firms now exposes Chinese counterparties not to American punishment, but to Chinese prosecution.
Why U.S. Secondary Sanctions Have Been So Effective
To appreciate the significance of this move, it helps to understand how the U.S. sanctions architecture actually works.
Primary sanctions are direct: they prohibit American companies from doing business with a designated target. When the U.S. first sanctioned Huawei, firms such as Qualcomm and Broadcom were barred from supplying it. But primary sanctions alone often leave gaps. Targeted entities can route commerce through third parties in non-sanctioned jurisdictions and continue to function.
Secondary sanctions close that gap. They extend Washington's reach to any foreign company or country that continues doing business with a sanctioned target — regardless of whether that business has any U.S. nexus. This is what critics call the "long arm" of extraterritorial jurisdiction.
The mechanism works because of structural facts about the global economy: the U.S. dollar's dominance as the world's reserve currency, America's position as the largest import market, and Washington's central role in global financial infrastructure. No credible institution wants to be cut off from dollar-denominated transactions. The result is near-universal compliance — not from legal obligation, but from financial self-preservation.
The 2020 SDN designation of then-Chief Executive Carrie Lam and ten other Hong Kong and mainland officials illustrated this starkly. Not a single bank would serve them — not foreign institutions, and not even China's four largest state-owned banks. Officials reportedly resorted to withdrawing cash at home to cover monthly expenses. The episode was almost farcical in its detail, but it demonstrated how comprehensively secondary sanctions can isolate individuals when financial institutions fear the consequences of non-compliance.
The Logic Behind Beijing's Escalation
It was precisely that 2020 episode that accelerated development of the 2021 blocking regulation — and this week marks the first time Beijing has actually deployed it against a specific U.S. sanctions action.
U.S. Secretary of State Marco Rubio responded with a warning: China itself risks secondary sanctions if it does not comply. Beijing's reply was measured but dismissive, announcing only that it would "closely monitor the issue of unjustified extraterritorial jurisdiction." The subtext was clear: it has no intention of backing down.
The threat of escalation cuts both ways. If Washington were to impose secondary sanctions on China over this dispute, the exchange could revive the spiraling tariff conflict of 2024 — and could prompt Beijing to deploy its rare earth leverage, restricting exports of materials for which the West currently has no credible short-term alternative supply. That asymmetry makes full escalation implausible. The U.S. threat, for now, may be little more than rhetorical positioning.
A Challenge That Could Unravel the Sanctions System
The deeper question is structural: if the blocking order holds, does it signal that U.S. sanctions have effectively lost their force against China?
The logic is internally consistent. China's blocking law transforms compliance with U.S. sanctions into a domestic legal violation. Chinese companies and financial institutions are therefore compelled by Chinese law to maintain their business relationships with the five sanctioned firms. Washington's options then narrow to two: expand the sanctions list to include every Chinese entity that continues dealing with the original five targets, or accept non-enforcement.
The first path leads to an absurd endpoint — sanctioning virtually the entire Chinese corporate sector, which is functionally indistinguishable from a complete economic rupture with China. That outcome is neither politically viable nor economically rational for either government.
But the second path sets a corrosive precedent. Accepting non-compliance signals that U.S. sanctions no longer bind Chinese entities. And if Beijing were to extend the blocking order's logic to foreign companies operating in China — requiring them to disregard U.S. sanctions as a condition of market access — the erosion could spread well beyond Chinese firms.
What the Outcome Signals to the World
This confrontation is not a marginal trade dispute. It is a direct test of whether the institutional infrastructure of U.S. economic coercion — built over decades and increasingly deployed as an alternative to military force — retains its authority when challenged by a peer competitor with sufficient economic mass to absorb the consequences.
Iran, Russia, and other actors subject to U.S. sanctions are watching. If Washington cannot enforce its measures against five Chinese refining companies, the implications extend far beyond the petrochemical sector. America's long arm, as this editorial board has previously noted, is only as credible as its last enforcement action.
The outcome of this particular confrontation is still unresolved. But the terms of the contest have shifted — and that shift, regardless of how this specific episode ends, will not be easily reversed. （Related： Trump and Xi Hold First Summit in Nine Years as Business Titans Join High-Stakes Beijing Talks ｜ Latest ）
