Marine traffic in the Strait of Hormuz fell this week, while the Houthi movement in Yemen announced a maritime embargo against Saudi Arabia and resumed attacks on Red Sea tankers. Lloyd’s List Intelligence recorded 78 transits in the Strait between July 13 and July 24, compared with 174 the previous week. Eastbound transits dropped to 44 from 101, and westbound transits fell to 34 from 73. The increase in Iranian‑linked vessels suggests a shift in routing, senior analyst Bridget Diakun said in a webinar on Thursday.
Iran attacked an oil products tanker off Oman and a crude oil tanker off the United Arab Emirates on Sunday, according to the International Maritime Organization. A separate attack on an oil‑chemical tanker occurred off Limah, Oman, on Monday. Both the crude tanker MT Acheloos (IMO 1087524) and the oil‑products tanker MT Kavomaleas (IMO 1042823) are owned by Dynacom Tankers, Lloyd’s List reported.
In response, President Donald Trump said the United States would strike Iranian infrastructure such as bridges or power plants for each ship hit. The U.S. blockade of vessels heading to and from Iranian ports remains in place, with a tanker boarded on July 17 by the United Kingdom Maritime Trade Organization. The guided‑missile destroyer USS Rafael Peralta (DDG‑115) has been involved in enforcing the blockade.
Senior analyst Chris Newton of the International Crisis Group said Iran’s leverage in negotiations depends on its control of the strait. He added that the U.S. cannot achieve its objectives through bombing, noting that previous attempts to do so failed before a ceasefire and that the Houthi campaign in the Red Sea has persisted despite U.S. strikes.
Newton observed that both the United States and Iran appear willing to endure prolonged economic pain to gain concessions. He said the resumption of Houthi attacks may provide Iran additional leverage while also serving the Houthis’ own interests. Satellite imagery showed increased naval activity in the Red Sea.
The Houthi embargo on Saudi shipping, announced after a Saudi airstrike on a Yemen airport on July 13, led some vessels to turn back rather than risk the Bab El‑Mandeb passage. Shipping volumes remain below pre‑2023 levels, Diakun noted, and the willingness of ship owners to use the Red Sea will depend on their risk tolerance. Newton said the Houthis are allowing some vessels linked to China and possibly Russia to pass unharmed.
Analysts warned that renewed fighting could affect global energy markets. Lower strategic and commercial reserves, including in the United States, and ongoing attacks in the Black Sea near Ukraine have tightened supply. Ukraine reported the death of 10 seafarers when the MV Golden Leo was struck off Odessa on Sunday; Russia is suspected of the attack. Reduced Russian refining capacity and Kazakhstan’s export ability are also affecting the market, Newton said. If China increases its imports, demand could rise and prices may spike, creating a geopolitically awkward situation for the United States.

