A key clause in the ceasefire agreement between the United States and Iran has emerged as the latest flashpoint threatening to derail diplomacy, with competing interpretations of control over the Strait of Hormuz pushing both sides back towards confrontation.

According to a Wall Street Journal analysis, the dispute centres on a provision in the memorandum of understanding that each side believed supported its own strategic objectives, leaving the agreement vulnerable from the outset.

One clause, two competing visions

The Journal says the disagreement focuses on Paragraph 5 of the deal, which commits Iran to restoring shipping through the Strait of Hormuz and working with Oman on its future administration. It also requires Tehran to ensure safe passage and remove military obstacles, including naval mines.

Washington viewed the clause as guaranteeing freedom of navigation through one of the world's most important energy corridors. Iranian hardliners, however, have interpreted the same language as recognition of Tehran's dominant role over the strategic waterway.

Hormuz becomes the real battleground

The competing interpretations have shifted negotiations away from Iran's nuclear programme and towards control of the Strait of Hormuz, a route carrying a significant share of global oil and gas exports.

Israeli geopolitical analyst Michael Horowitz told the Journal that the disagreement was built into the agreement from the beginning. He argued that Iran's calculations are driven less by economic incentives than by security concerns and strategic leverage.

Shipping disruption raises the stakes

The uncertainty has already affected commercial shipping. According to the Journal, vessel crossings through the Strait of Hormuz fell sharply during renewed exchanges of fire between the United States and Iran, dropping well below pre-war levels.

The report says Iranian officials continue to argue that future management of the waterway should be coordinated primarily with neighbouring Oman, reinforcing Tehran's claim to a leading role in the strait.

Diplomacy faces mounting pressure

A US official familiar with the negotiations acknowledged to the Journal that Paragraph 5 has become "problematic", with Washington and Tehran effectively operating from "different planets" in their interpretation of the agreement.

With both sides refusing to retreat from their positions, the ceasefire's foundations appear increasingly fragile, raising fresh doubts over whether wider negotiations on Iran's nuclear programme can regain momentum before tensions escalate again.

Trump's war reignites because of one central 'flaw in the MOU': WSJ analysis

Trump will get a peace prize for sure. He ended dozens of wsrs. The Iranian war he will have ended at least 15 times.