IRGC warns against new Hormuz route for ships: What we know

Experts say disagreements over shipping routes and transit fees could complicate efforts to reach a permanent agreement.

Iran’s Islamic Revolutionary Guard Corps (IRGC) has warned commercial vessels to only use routes through the Strait of Hormuz approved by Tehran, reopening a point of friction in fragile negotiations between the United States and Iran over the future of the strategic waterway.

The dispute remains one of the unresolved issues after a memorandum of understanding (MoU) was signed by the United States and Iran last week, which largely halted hostilities in the four-month US-Israel war on Iran and which launched a 60-day negotiation process aimed at reaching a broader peace agreement.

Both Washington and Tehran have declared the strait open to commercial shipping, but questions remain over whether Iran will seek greater control over vessel movements, whether it will impose transit or service fees on ships using the strait following the 60-day negotiating period, and whether disagreements over the waterway could derail efforts to reach a permanent agreement altogether.

The Strait of Hormuz is one of the world’s most strategically significant waterways, with around one-fifth of global oil and liquefied natural gas (LNG) supplies normally being shipped through the narrow passage linking the Gulf to the Arabian Sea.

Bordered by Iran to the north and Oman and the United Arab Emirates (UAE) to the south, the strait is only about 50km (31 miles) wide at its entrance and exit, narrowing to about 33km (21 miles) at its tightest point. Despite its width, it is deep enough to accommodate the world’s largest oil tankers.

According to the US Energy Information Administration, about 20 million barrels of oil and petroleum products transited the strait each day in 2025, representing hundreds of billions of dollars in annual energy trade.

The route is used not only by Iran but also by Iraq, Kuwait, Qatar, Saudi Arabia and the UAE. It is also vital for global fertiliser exports, with roughly one-third of international fertiliser trade normally passing through the strait.

The IRGC says Oman and the IMO announced the new shipping corridor without consulting Tehran. “Certain authorities have announced a new shipping route through the Strait of Hormuz without prior notification to or coordination with the Islamic Republic of Iran. The proposed route is unacceptable and poses serious safety risks,” the force said.

“The only authorised transit routes through the Strait of Hormuz are those designated by the Islamic Republic of Iran,” it said, adding that