Tariffs will go into effect along with U.S. tariffs beginning on Sept. 15.
Two U.S. shale producers have challenged an energy pipeline operator's proposed surcharge for the Trump administration's 25% tariff on imported steel, raising the stakes for pipeline builders facing higher construction costs.
The report by OPEC also said oil inventories in developed economies rose in June, suggesting a trend that could raise the group's concern over a possible oil glut.
Frontline and Golden Ocean will acquire 15% and 10% interests in the joint venture respectively, while commodity trader Trafigura will contribute its existing physical bunkering activities and own the remaining 75%.
Imports could have averaged as much as 360,000 bbl/d.
No other countries have joined the mission to protect merchant vessels.