When President Trump announced Sunday that the US Navy would blockade the Strait of Hormuz, shipping companies worldwide had one question: who exactly gets stopped? The answer matters most to Beijing. The Hormuz blockade Chinese ships face is more nuanced than the president’s social media post suggested.
The boss asked a sharp question this week, and the answer cuts through the fog of war rhetoric. CENTCOM clarified that the blockade targets vessels “entering or exiting Iranian ports” but “will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports.”[s] That distinction is everything.
Hormuz Blockade Chinese Ships: Who Gets Stopped?
China receives 37.7% of all oil exports that pass through the Strait of Hormuz, more than any other country.[s] But receiving Hormuz oil and buying Iranian oil are different things. Before the war, China purchased roughly 90% of Iran’s exports, accounting for about 13% of China’s total oil imports.[s]
Under the new rules, a Chinese tanker picking up Saudi crude from Ras Tanura should pass freely. A Chinese tanker that paid Iran’s million-dollar “tollbooth” fee will be intercepted.[s] The US also threatened to intercept any vessel that paid a toll to Iran, regardless of current destination.
Two Chinese state-owned tankers, both very large crude carriersOil tankers with capacity between 200,000-320,000 deadweight tons, used for transporting crude oil across oceans. owned by COSCO, transited the strait on Saturday using Iran’s screening process.[s] Whether more will follow now that the US blockade is active remains uncertain. Ship traffic dropped dramatically within hours of Trump’s announcement.
Why China Can Absorb the Shock
China has spent twenty years reducing its vulnerability to exactly this scenario. The country holds an estimated 1.2 billion barrels of crude in strategic reserves, enough for three to four months of imports.[s] Overland pipelines from Russia and Central Asia have diversified supply. Electric vehicles now account for over half of new car sales, reducing gasoline demand.
Oil shipments through Hormuz account for only 6.6% of China’s total energy consumption, according to Nomura’s chief China economist.[s] That is a manageable exposure, not a fatal one. The Hormuz blockade Chinese ships encounter will hurt, but not cripple. OCBC analysts concluded that China is “less sensitive to a prolonged closure of the Strait of Hormuz than many of its Asian peers.”
Beijing’s Response
China’s Foreign Ministry called for calm. “Keeping the key Strait of Hormuz waterway safe, stable and unimpeded served the interest of the international community,” spokesperson Guo Jiakun said Monday.[s] Beijing rejected reports that it planned to supply weapons to Iran as “groundless smears.”
The Hormuz blockade Chinese ships must navigate creates diplomatic pressure on Beijing to push Tehran toward a deal. As one analyst noted, China “would be incentivized to lobby Tehran to reopen the strait.”[s] Whether Beijing exercises that leverage remains to be seen.
The head of the International Energy Agency called the disruption “the worst energy shock the world has ever seen.”[s] For Chinese shipping, the path forward depends on one question: where are you going, and did you pay Iran to get there?
The Hormuz blockade Chinese ships face as of April 13 is legally and operationally distinct from a general strait closure. President Trump’s Sunday announcement declared that the US Navy would blockade “any and all Ships trying to enter, or leave, the Strait of Hormuz.”[s] CENTCOM’s subsequent clarification narrowed the scope considerably.
A topic the one who signs the checks flagged for examination, and one that reveals the gap between political theater and operational reality.
Hormuz Blockade Chinese Ships: Operational Rules
CENTCOM stated that American forces would “impartially” enforce the blockade against “all maritime traffic entering and exiting Iranian ports” along the Persian Gulf and Gulf of Oman. Crucially, the statement added that US forces “will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports.”[s]
This creates a bifurcated enforcement regime. Chinese vessels loading Saudi, Iraqi, Kuwaiti, or Emirati crude should face no interdictionLaw enforcement efforts to intercept and seize illegal drugs before they reach their intended markets or users., assuming they have not paid tolls to Iran’s “tollbooth” system. Vessels that used Iran’s screening process to transit during the preceding weeks, or that are bound for Iranian ports, face interception.
Two very large crude carriersOil tankers with capacity between 200,000-320,000 deadweight tons, used for transporting crude oil across oceans. owned by China COSCO Shipping Corporation transited the strait Saturday under Iran’s tollbooth arrangement.[s] The Yuan Hua Hu and Cospearl Lake were the first confirmed Chinese state-owned tankers to pass since the disruption began. Both vessels made it through before the US blockade activated Monday at 10 a.m. ET. Ships that attempt the same passage now face different odds.
Legal Framework: UNCLOSUnited Nations Convention on the Law of the Sea; the international treaty that governs maritime law and territorial waters. and Transit PassageThe legal right of ships to navigate through international straits without interference from coastal states, as established by UNCLOS.
The Strait of Hormuz falls under Part III of the United Nations Convention on the Law of the Sea. Article 38 establishes that “all ships and aircraft enjoy the right of transit passage, which shall not be impeded.”[s] Article 44 is more explicit: “States bordering straits shall not hamper transit passage… There shall be no suspension of transit passage.”[s]
The legal position is contested. “Under international law, specifically the rules governing international straits, the U.S. has no legal authority to close, suspend, or impede transit passage through Hormuz,” noted Ben Emons of Fed Watch Advisors.[s] Only Iran and Oman are coastal states, and even they are prohibited from suspending transit. The US argues its blockade targets Iranian ports, not the strait itself, threading a legal needle that many experts find unpersuasive.
Andreas Krieg of King’s College London characterized the operation as “complicated, high-risk, and legally contentious.”[s] Enforcement would require identifying, tracking, hailing, diverting, and potentially boarding vessels “in one of the most crowded and politically sensitive waterways in the world.”
Military Requirements
Retired Admiral James Stavridis, former NATO Supreme Allied Commander, estimated the Hormuz blockade Chinese ships and other traffic face would require “two aircraft carrier strike groupsA naval formation centered on an aircraft carrier, including destroyers, frigates, supply ships, and supporting aircraft. Designed to project power across vast ocean distances and conduct sustained military operations. that would provide air cover, plus a dozen destroyers and frigates operating outside the Persian Gulf.”[s] Another half-dozen warships plus UAE and Saudi vessels would operate inside the Gulf.
The US had 18 warships in the Middle East before the war began, including two carrier strike groups. A third carrier strike group and additional Marine Expeditionary Units are en route. Two destroyers began mine-clearing operations Saturday in the strait, described previously by Navy officials as an Iranian “kill box” filled with anti-ship missiles, drones, fast-attack boats, and mines.
China’s Exposure and Resilience
China receives 37.7% of all crude oil and condensate exports transiting Hormuz, the largest share of any country.[s] In 2024, 84% of crude moving through the strait went to Asian markets, with China, India, Japan, and South Korea accounting for 69% of flows.[s]
However, China’s actual vulnerability is lower than raw import figures suggest. Approximately 40% to 50% of China’s seaborne oil imports transit Hormuz, not total imports.[s] Overland pipelines from Russia and Kazakhstan bypass maritime chokepointsA narrow sea passage between landmasses where shipping must concentrate because alternative routes are economically prohibitive. A single disruption can cascade across global supply chains. entirely. The Hormuz blockade Chinese ships face matters less when half the oil arrives by land. As a share of total energy consumption, Hormuz oil accounts for only 6.6%, according to Nomura.[s]
Strategic reserves provide additional buffer. China held an estimated 1.2 billion barrels of onshore crude stockpiles as of January 2026, covering three to four months of net imports.[s] The rapid electrification of China’s vehicle fleet, with over half of new passenger cars now being new-energy vehicles, further insulates the economy from oil shocks.
Beijing’s Diplomatic Calculus
Foreign Ministry spokesperson Guo Jiakun urged all parties to “remain committed to resolving disputes through political and diplomatic means.”[s] Beijing has positioned itself as a mediator, backing Pakistan’s peace talks while calling for an immediate ceasefire. China rejected allegations of weapons transfers to Iran as “groundless smears and malicious associations.”
The Hormuz blockade Chinese ships navigate creates pressure on Beijing in both directions. Washington explicitly aims to leverage China’s oil imports to push Beijing to pressure Tehran. “China, which buys most of Iran’s oil, would be incentivized to lobby Tehran to reopen the strait,” noted Robin Brooks of the Brookings Institution.[s] But Beijing must balance that pressure against its strategic partnership with Tehran and its interest in appearing as an independent power broker rather than a US proxy.
The head of the International Energy Agency called the disruption “the worst energy shock the world has ever seen.”[s] For Chinese shipowners, the immediate calculus is straightforward: avoid Iranian ports, avoid paying Iranian tolls, and the US Navy should let you through. The longer-term calculus, about supply chains, strategic reserves, and the balance of power in the Gulf, remains far more uncertain.
