ERBIL, Kurdistan Region of Iraq - Iranian parliament speaker and chief negotiator Mohammad Bagher Ghalibaf said on Wednesday that preserving Tehran's “arrangements” in the Strait of Hormuz is vital to the country's national security.

In a statement carried by state media, Ghalibaf said that Tehran’s national security “lies in maintaining the ‘Iranian arrangements’ on the Strait of Hormuz and ensuring the maximum safe and harmless passage of commercial ships through this waterway.”

Iranian authorities have repeatedly stressed Tehran's right to maintain control over the vital waterway in cooperation with coastal Oman, a proposition that Washington has repeatedly rejected, insisting on a greater role in overseeing the waterway and the free passage of ships.

“During the negotiations, we also established Iran’s resistance and arrangements for the Strait of Hormuz in Article 5 of the Memorandum of Understanding (MoU),” Ghalibaf added.

The fifth clause of the US-Iranian MoU reached in mid-June stresses that Iran will make arrangements “using its best efforts” to ensure the safe passage of commercial vessels free of charge for 60 days, adding that Iran will define future administrative measures at the strait with Oman.

Ghalibaf accused the US of attempting to render the Iranian arrangements ineffective “by force.”

Washington and Tehran have traded strikes for several days, with US President Donald Trump last week saying that the truce with Tehran “is over,” 21 days after the agreement was signed.

Late Tuesday, the US Central Command (CENTCOM) announced that it had resumed the naval blockade against vessels transiting to and from Iranian ports.

The Iranian Army said early Wednesday that the US had fired 13 missiles at one of its bases in Sistan-Baluchistan's Bampour, with the total death toll from the recent attacks rising to 30.