A US-sanctioned tanker, the Chinese-owned Rich Starry, transited through the Strait of Hormuz on Tuesday despite a US blockade of the vital oil chokepoint, shipping data from LSEG showed, in what appears to be a direct challenge to President Donald Trump’s naval enforcement operation . The vessel, which is part of Iran’s so-called “shadow fleet” of tankers that operate with transponders dark to evade detection, was reported to be drifting off Iran’s Qeshm Island shortly after the blockade took effect, but later completed its passage . The development comes as the US Navy officially began its blockade of Iranian ports on Monday, with CENTCOM stating that the enforcement would be applied “impartially against vessels of all nations entering or departing Iranian ports and coastal areas” . Another tanker, the Botswana-flagged Ostria Samini, turned back just 41 minutes after the blockade took effect, changing its destination from Oman to the UAE .
The successful transit of the Rich Starry highlights the operational challenges facing the US Navy as it attempts to enforce a blockade of one of the world’s busiest waterways. Intercepting vessels linked to China carries significant escalation risks, as Beijing has been a primary purchaser of Iranian crude throughout the war, with its “ghost fleet” of tankers continuing to operate using yuan-based settlement systems that bypass US-controlled financial networks . The US has warned that any vessel that has paid a “toll to Iran” will be intercepted, but enforcing that policy against Chinese-flagged or Chinese-owned vessels could trigger a major diplomatic crisis between Washington and Beijing . Iranian officials have warned that any US attempt to enforce the blockade will be met with resistance, with the Revolutionary Guards stating that military vessels approaching Iranian shores will be considered a breach of the ceasefire .
The transit of the sanctioned tanker also underscores the limitations of the US strategy to choke Iran’s oil revenues through naval interdiction. Iran’s network of “shadow fleet” vessels has continued to operate throughout the war, with many using transponders that broadcast false locations or turn them off entirely to evade detection . The vessels are often reflagged and renamed to avoid sanctions, making enforcement difficult even for the most sophisticated naval forces. Iranian officials have also threatened that if their ports are threatened, “no port in the Persian Gulf and Gulf of Oman will be safe,” suggesting that Tehran could retaliate against Gulf oil terminals if the US blockade proves effective .
The blockade, which Trump announced after the collapse of peace talks in Islamabad, is designed to cut off Iran’s oil revenues, which fund nearly half of the government’s budget. However, the successful transit of the Rich Starry suggests that enforcing the blockade will be far more difficult than the administration anticipated . The US Navy has not commented on the specific incident, but officials have previously stated that the blockade will be enforced “impartially” and that vessels attempting to violate it will be subject to interdiction. As the diplomatic window narrows and the threat of renewed hostilities looms, the question of whether the US can effectively enforce its blockade may determine the outcome of the economic war—and the broader conflict itself
