The United States has issued an urgent maritime warning ordering U.S.-flagged commercial vessels to stay clear of Iranian territorial waters while transiting the Strait of Hormuz. The advisory comes just days after indirect U.S.-Iran talks in Oman and follows reports of Iranian IRGC gunboats harassing an American oil tanker. With Iran threatening to shut down the Hormuz chokepoint if attacked, and nearly 20% of global oil trade passing through the strait, tensions are rising sharply amid naval encounters, drone incidents, and fragile diplomacy.