At least three US-sanctioned Iranian-flagged tankers have exited the Gulf of Oman as the Trump administration eyes Tehran's moves ahead of sanctions waivers expected to begin Friday.

Trump says oil ships are moving through the Strait of Hormuz under US military escort after Iran's blockade crushed traffic to 15% of normal levels.

Iran's Tasnim News Agency claims three oil tankers crossed the US naval blockade in the Strait of Hormuz, raising questions about enforcement and oil market