Iran has blacklisted dozens of tankers using the Strait of Hormuz and threatened wider penalties as the United States prepares a major new sanctions offensive against Tehran.

Tanker traffic through the Strait of Hormuz remains severely depressed as Washington threatens an unprecedented economic offensive against Iran and Tehran threatens Gulf oil…

Iran warned on Sunday that some ships failing to comply with its transit regulations in the Strait of Hormuz could face penalties during subsequent passages, including fines,…