Shipping stalls in Strait of Hormuz after Iran declares key waterway shut

Iran declared the Strait of Hormuz closed on June 20, 2026, citing a "blatant breach" of a recently signed US-Iran Memorandum of Understanding and ongoing Israeli military operations against Hezbollah in Lebanon. This move by Iran's top joint military command came shortly after a period where shipping traffic had cautiously resumed following a preliminary agreement that aimed to lift restrictions on movement through the vital waterway.

However, the United States swiftly disputed Iran's claim, with Vice President JD Vance and US Central Command asserting that the Strait of Hormuz remains open for commercial shipping. Despite these assurances, shipping data and maritime analysts indicate a significant slowdown in vessel transits, particularly through the strait's northern route, as shipowners exercise caution amidst the conflicting reports and heightened security risks.

The renewed closure of this strategic chokepoint, crucial for global oil and gas shipments, is viewed as a test of the fragile ceasefire agreement between the US and Iran. Further complicating the situation, the central part of the strait reportedly remains hazardous due to an estimated 80 mines laid during earlier conflicts, contributing to the uncertainty and disruption of global trade flows.