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U.S. Seizes Iranian Tanker in Gulf of Oman as Diplomatic Deadline Looms

The U.S. military heightens maritime enforcement as Tehran weighs Washington’s terms for an end to the conflict.

May 21, 2026 at 6:00 PM

The U.S. military has expanded its maritime enforcement against Iran, boarding the Iranian-flagged oil tanker M/T Celestial Sea in the Gulf of Oman on Wednesday. The operation, conducted by U.S. Central Command, follows reports that the U.S. is enforcing a strict maritime blockade that has already led to the rerouting of nearly 90 commercial vessels. This increased pressure comes as President Donald Trump signaled a brief diplomatic window, stating he would wait a few days for "the right answers" from Tehran regarding a proposed deal to end the war. In response to the tightening naval restrictions, the Islamic Revolutionary Guard Corps (IRGC) issued a stern warning that any further military action against Iran could prompt retaliation reaching beyond the Middle East. Despite the heightened rhetoric and maritime friction, regional diplomatic efforts continue; Turkish President Tayyip Erdogan reportedly held talks with President Trump, advocating for an extension of the current ceasefire to resolve outstanding disputes. Internally, Iran appears to be hardening its security posture, with state media reporting the execution of two individuals on Thursday charged with disrupting national security. While the ceasefire remains fragile, the focus of the conflict has shifted toward open-sea commercial enforcement and the strategic maritime insurance shock affecting global shipping lanes.

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