Iran on the 28th (local time) condemned the U.S. airstrikes as a violation of the cease-fire memorandum of understanding (MOU).
According to CNN and others, Iran's Foreign Ministry issued a statement the same day, saying, "This attack shows that the United States does not value its promises at all, is an unreliable country, and that breaking promises is America's nature."
It added, "The Islamic Republic of Iran once again reaffirms its resolve to defend national sovereignty and territorial integrity against America's military aggression."
Earlier, U.S. Central Command said that, in retaliation for Iran's attack on a merchant ship in the Strait of Hormuz, it carried out airstrikes the same day using Navy and Air Force fighter jets on 10 Iranian military facilities near the strait.
Article 1 of the cease-fire memorandum of understanding (MOU) signed by the United States and Iran on the 17th includes ending military operations on all fronts, including Lebanon, and banning mutual hostile acts and the use of force.
However, tensions in the Strait of Hormuz are rising again as both sides continued armed clashes for two consecutive days after signing the MOU. Immediately after the U.S. airstrikes, the Islamic Revolutionary Guard Corps (IRGC) said it attacked U.S. facilities in Bahrain and Kuwait with missiles and drones.