TEHRAN -- A senior advisor to Iran's supreme leader said on Saturday the United States has violated a recently signed peace memorandum of understanding (MoU) between Tehran and Washington by continuing to create tension in the Strait of Hormuz.

Mohsen Rezaei, who is also a former commander of the Islamic Revolution Guard Corps (IRGC), made the remarks in a post on social media platform X hours after the United States carried out airstrikes on Iran's southern coastal areas.

He said, "The United States, by supporting the actions of its proxy force (Israel) in the region and continuing to create tension in the Strait of Hormuz, has violated the first and fifth paragraphs of the (peace) MoU."

Under the first paragraph of the MoU signed on June 18, Iran and the United States, as well as their allies, declared the immediate and permanent termination of military operations on all fronts, including in Lebanon, and undertook not to initiate any war or military operation against each other. According to the fifth paragraph, Iran is responsible for arranging the safe passage of commercial vessels through the Strait of Hormuz for 60 days, at no charge.

Rezaei warned that Iran's response to the violation of each paragraph of the MoU will be "swift and crushing."