In a post on X, Mohammad Bagher Ghalibaf said the "violations" include the U.S. naval blockade of Iranian ports—which he claimed took the global economy "hostage"—and "warmongering" by Israel "on all fronts."

The refusal comes despite U.S. President Donald Trump’s Tuesday night announcement extending the ceasefire.

White House Press Secretary Karoline Leavitt clarified the extension is open-ended with no new deadline.

Leavitt stated that Trump is "satisfied" with the ongoing naval blockade and "understands Iran is in a very weak position."

She added, "the cards are in President Trump's hands right now," noting that the war will end only when Trump "feels it's in the best interests of the United States and the American people."

Proposed peace talks in Pakistan have yet to begin. U.S. Vice-President JD Vance, who is scheduled to lead the delegation, remains in the United States.

Iran's President Masoud Pezeshkian said his country remains open to dialogue but warned that "breach of commitments, blockade and threats are main obstacles to genuine negotiations".

The diplomatic standoff coincides with rising violence in the vital shipping route. On Wednesday morning, Iran announced it had "seized" two cargo ships for "inspection" following reports that three other vessels were attacked in the strait.