ERBIL, Kurdistan Region of Iraq - US President Donald Trump said Sunday that American representatives will travel to Islamabad on Monday for negotiations with Iran, threatening major strikes should talks fail.

Since the reaching of a ceasefire between the US and Iran on April 8, the two sides held one round of talks in the Pakistan, which did not lead to a lasting solution.

“My representatives are going to Islamabad, Pakistan, they will be there tomorrow evening, for negotiations,” Trump said in a statement on Truth Social.

Trump accused Iran of violating a ceasefire agreement by opening fire in the Strait of Hormuz on Saturday, saying some shots were aimed at a French vessel and a British freighter.

“Iran decided to fire bullets yesterday in the Strait of Hormuz, a total violation of our ceasefire agreement,” he said. “Many of them were aimed at a French ship, and a freighter from the United Kingdom.”

He added that Iran had recently announced it was closing the strategic waterway, referring to the incident as “strange,” as he claimed a US-led blockade had already shut the passage.

Trump said Iran would bear the economic cost of any closure, claiming the country loses $500 million per day, while saying the United States would not be affected.

“They’re helping us without knowing, and they are the ones that lose with the closed passage,” he said.

He said Washington had offered Tehran a “very fair and reasonable deal,” but warned of severe military action if Iran rejected it.

“If they don’t, the United States is going to knock out every single power plant, and every single bridge, in Iran,” he said. “No more Mr. Nice Guy.”

He added that Iran would “come down fast and come down easy” if it accepts the proposal, but said if no agreement is reached, “it will be my honor to do what has to be done.”

Responding to Trump’s remarks, Esmaeil Baghaei, spokesperson for Iran’s foreign ministry, said Sunday that the United States’ so-called blockade of Iranian ports or coastline was “not only a violation of the Pakistani-mediated ceasefire but also both unlawful and criminal.”

Baghaei said the move violated Article 2(4) of the United Nations Charter and amounted to an act of aggression under a 1974 UN General Assembly resolution.

He further accused Washington of imposing collective punishment on the Iranian population, saying it amounted to “war crime and crime against humanity.”