The United States and Iran are crossing each other's red lines, one after the other. The latest hostilities began with an Iranian drone attack on a cargo ship in the Strait of Hormuz on June 25, a week after they had signed an interim deal aimed at ending the war.

The U.S. and Iran traded heavier strikes Thursday as a weeklong escalation threatened to unravel last month's truce, though Tehran's release of a...

The interim ceasefire agreed to last month has collapsed, and the region has endured days of back-and-forth attacks by the U.S. and Iran as they battle for control of the Strait…