China, US, and Iran: A Sanctions Standoff With a Military Edge
China has called the US threat of secondary sanctions over its trade with Iran illegal and warned it would take "all necessary measures" to protect its national interests, escalating a confrontation that now spans financial pressure, military posture, and shipping security in the Strait of Hormuz.
US Treasury Secretary Scott Bessent announced an initial set of sanctions on 60 individuals, entities, and vessels for alleged involvement in trade with Iran, naming the campaign "Operation Economic Outcast." Notably, the list excluded any Chinese financial institutions, despite their documented role in financing Iranian oil trade. China buys an estimated 80% of Iran's oil exports, according to The Guardian.
Secondary sanctions are a specific tool: they punish not the sanctioned country itself, but third parties — in this case, foreign companies or banks — that continue doing business with it. The idea is to force other countries to choose between trading with the target or losing access to the US financial system.
Chinese Foreign Ministry spokesperson Lin Jian said China "firmly opposes illegal unilateral sanctions and would take all necessary measures to safeguard its rights and interests." The remarks echoed a softer formulation from August 24, when Beijing said it would "closely watch developments and do what is necessary to protect its rights" as the US prepared to unveil the new measures, per Reuters. The language hardened within 24 hours of the sanctions being formally announced.
The omission of Chinese banks from the initial sanctions list is striking given the scale of the bilateral oil trade it underpins. China's big state refiners have shunned Iranian crude since 2019, when the US reimposed sanctions on Tehran. China's official customs data likewise do not reflect direct purchases of Iranian crude by Chinese buyers since that year, according to Reuters. That gap between recorded imports and the estimated 80% share of Iranian oil exports flowing to China points to a sprawling sanctions-evasion architecture involving front companies, ship-to-ship transfers at sea, and informal payment mechanisms outside the conventional banking system.
The sanctions rollout was accompanied by an explicit military dimension. US Defence Secretary Pete Hegseth said the US was not ruling out the use of kinetic strikes — meaning military attacks with weapons — in the Strait of Hormuz or around Iran. Hours later, an oil tanker was reportedly hit by an unidentified projectile at the mouth of the Strait of Hormuz. No attribution for the attack has been confirmed.
Iran responded with its own escalation in rhetoric. Economy Minister Ali Madanizadeh said on state television: "Our defence is no longer so defensive; the enemies should wait for an attack." Two days earlier, on August 23, Iran's foreign minister dismissed the threat of new US sanctions as a sign of desperation and predicted the measures would fail, Reuters reported.
Lin Jian has held regular press conferences throughout August, including daily briefings from August 17 through 25, according to the Chinese Ministry of Foreign Affairs. The ministry has previously issued statements opposing US unilateral sanctions, including a June 5, 2026, response to US sanctions on the Cuban president and other individuals.
The broader context here matters. The initial sanctions list targets mid-level nodes in the sanctions-evasion network — individuals, entities, and vessels — while leaving the financial infrastructure that makes the trade possible untouched. That is a deliberate calibration. Designating Chinese banks would cross a threshold that Washington has repeatedly avoided since 2019, risking retaliation against US financial interests and potential disruption to broader Sino-American economic ties. The current approach preserves what strategists call escalation dominance: the threat of secondary sanctions on Chinese financial institutions remains available without having been used.
Beijing's reaction tracks with its established playbook on US extraterritorial sanctions — those that apply beyond US borders to foreign actors. China frames secondary sanctions as violations of its sovereignty and free-trade rights under international law. That framing is not merely rhetorical. It provides the legal and political basis for countermeasures, whether through the WTO, bilateral channels, or expanded use of alternative payment systems that bypass dollar-denominated clearing.
The military overlay is the variable that most distinguishes this round from prior sanctions cycles. Hegseth's reference to kinetic strikes, the tanker incident at the mouth of Hormuz, and Madanizadeh's confrontational language all point to a scenario where the sanctions campaign and a live security crisis in the Gulf could merge. Roughly one-fifth of global oil consumption transits the Strait of Hormuz daily. Any sustained disruption there would feed directly into energy markets and, by extension, into the inflation trajectories of every major economy.
For now, the parties are testing thresholds. Washington has signaled capability and intent across both the financial and military domains while stopping short of maximal measures. Beijing has issued a firm rhetorical line without specifying countermeasures. Tehran has dismissed the sanctions while adopting a more offensive posture in its public messaging. The tanker strike, if it presages a campaign against commercial shipping, could narrow the space for de-escalation rapidly.
