The United States on Monday moved to implement a blockade of Iranian ports in the Strait of Hormuz, one of the world’s most critical shipping corridors, after US-Iran peace talks failed over the weekend, but questions persist over how fully the measures can be enforced and what they will mean in practice. Despite concerns of escalation, Pakistan, which has acted as mediator in the peace negotiations, continued efforts to resolve the ongoing conflict, including a phone call with China’s Foreign...