Why is the Strait of Hormuz blocked despite US-Iran ceasefire? The Strait of Hormuz blocked issue persists because the ceasefire is not a full peace agreement. It is temporary, fragile, and filled with conditions. Both sides remain cautious, and trust is extremely limited. This uncertainty is enough to keep the shipping lanes restricted. The Iran is exercising significant influence over maritime movement in the region. Reports suggest that ships must follow strict protocols before entering or crossing the strait. This controlled access is a major factor behind the ongoing Strait of Hormuz blocked situation.