Hormuz Tightens as Iran’s Dark Fleet Stalls and Enforcement Widens in International Shipping News 04/06/2026 A Parallel Enforcement Track Takes Shape in the Atlantic On the enforcement side, pressure on both Iranian and Russian shadow tonnage intensified across the same reporting cycle. The U.S. Department of the Treasury issued a new Operation Economic Fury action targeting Iranian maritime extortion, expanding the cumulative enforcement track against Iranian shadow fleet logistics and complementing the prior 28-vessel designations issued since April 15. Following the U.S. Navy interdiction of the LIANSTAR, Windward identified four additional vessels operating in the same area with similar static and dynamic characteristics. All four called at Iranian ports after February 28, 2026, and all four are operating under fraudulent registries. On June 1, in European waters, the French Navy, with UK support, boarded the falsely flagged Aframax tanker TAGOR (IMO 9282481) off Brest. The vessel had departed the Russian Arctic port of Murmansk. Upon boarding, French authorities identified an irregularity of the flag, effectively a false-flagging violation. Windward analysis shows that on May 26, mid-voyage, TAGOR changed its MMSI and broadcast flag from Madagascar to Cameroon and continued south toward Brest under the new identity. The pre-switch broadcast had indicated the vessel was sailing in ballast. Vortexa data indicates TAGOR was, in fact, laden with approximately 700,000 barrels of Arco crude loaded at Murmansk, exposing the gap between declared posture and actual cargo state. TAGOR’s original Madagascar registration was already invalid. Madagascar does not operate a ship registry. Under Article 110 of UNCLOS, stateless vessels can be boarded on the high seas by warships of any nation. The June 1 boarding is the tenth Russia-linked vessel interdicted by UK or European military forces in 2026, and the thirteenth across the past 18 months. France has previously detained