The Middle East-based commanders of the US, British and French navies have transited the Strait of Hormuz aboard an American warship, a sign of their unified approach to keeping the crucial waterway open after Iran seized two oil tankers. Tensions in the Persian Gulf have been volatile since Iran’s nuclear deal with world powers collapsed, following the US’s unilateral withdrawal five years ago. The incredibly rare, joint trip by the three navy chiefs aboard the USS Paul Hamilton, an Arleigh Burke-class destroyer, saw three fast boats of the Iranian Revolutionary Guard approach the vessel at one point.