The British overseas territory of Gibraltar released a seized Iranian supertanker Thursday over last-minute objections from the U.S., potentially easing tensions between London and Tehran, which still holds a British-flagged vessel. The release of the Grace 1 comes amid a growing confrontation between Iran and the West after U.S. President Donald Trump pulled Washington out of Tehran’s nuclear deal with world powers over a year ago. In past weeks, the Persian Gulf region has seen six attacks on oil tankers that the U.S. has blamed on Iran and the downing of a U.S. surveillance drone by Iranian forces.