The United States' naval blockade targeting Iran has come into force -but early signs suggest enforcement may be more limited than absolute. Despite warnings of interception, multiple vessels - including sanctioned tankers - have continued to transit the Strait of Hormuz. While the US advisory applies specifically to ships linked to Iranian ports, several vessels not covered under those criteria have passed through without disruption. However, the movement of previously sanctioned tankers has raised questions about the effectiveness and monitoring of the blockade. In a notable twist, one vessel reportedly reversed course after crossing into the Gulf of Oman, even as Tehran publicly mocked the US move. The developments suggest a complex enforcement landscape, where legal scope, strategic signalling, and real-world navigation are beginning to diverge. As traffic continues through one of the world's most critical energy corridors, the key question remains: is this a tightly controlled blockade- or a calibrated pressure tactic with visible limits?