Iran has no binding obligations under the 1982 UN Convention on the Law of the Sea regarding the Strait of Hormuz, and conventions do not apply during wartime in any case, Iranian legal scholar Ali Bahadori-Jahromi has argued, IRGC media said on April 22.

The sudden analysis formed part of the 25th edition of the Guards' wartime commentary series, addressing legal issues around the Strait; however, this is the Iranian interpretation as the US continues to blockade Iran's maritime trade.

Bahadori-Jahromi, a lawyer and university professor, said Iran's initial signature of the post-revolutionary 1982 convention did not create binding obligations on the country.

"Iran has no obligation under the 1982 convention regarding the Strait of Hormuz. Of course, even if we had ratified it, conventions do not function during wartime," he was quoted as saying in an interview with Fatemeh Tazari.

Iran issued significant reservations at the time of signing and has stated that the convention should not be considered customary international law.

Oman, which shares the other shore of the strait, has issued an interpretive declaration accepting the concept of innocent passage, Bahadori-Jahromi said.

The legal argument comes as Iran prepares for the expiry of the Pakistan-brokered ceasefire with the US on April 22. The Iranian parliament has drawn up a Strait of Hormuz management plan that would impose Israeli shipping bans, rial tolls and a compensation clause covering Iranian losses from the US naval blockade.

Tehran has closed the strait in response to US actions on several occasions during the 54-day war, with oil prices spiking. Brent crude rose 5% to $94.72 a barrel on April 20 after the US seizure of the Iranian vessel Touska prompted the latest closure.

The Strait of Hormuz carries around a fifth of the world's oil and liquefied natural gas supply.