U.S. President Donald Trump said Sunday he does not care if Iran comes back to negotiations with the United States after talks in Pakistan failed to produce a deal.

"I don't care if they come back or not. If they don't come back, I'm fine," Trump told reporters at Joint Base Andrews in Maryland, upon his return from Florida.

The U.S. military said it would begin a blockade of all Iranian ports Monday, after talks between the warring sides in Pakistan collapsed, and despite the Iranian military warning that it would treat any such action as an act of piracy.

Trump had announced on social media he would blockade the strategic Strait of Hormuz trade route that he has been demanding Tehran fully re-open, after Vice President JD Vance left negotiations with an Iranian delegation in Islamabad.

Pope Leo XIV on Monday began a landmark visit to Algeria in the first trip to the Muslim-majority country by a pontiff.

Turkey's foreign minister said on Monday he believed Iran and the United States are "sincere" about reaching a ceasefire despite the failure of Pakistan-mediated talks on the weekend.

Iran and the United States failed to strike a deal Sunday to end the war in the Middle East, but there was no immediate return to hostilities and world leaders quickly urged both sides to pursue the diplomatic route to peace.

U.S. President Donald Trump on Sunday ordered a U.S. naval blockade of the Strait of Hormuz in response to Iran's "unyielding" refusal to give up its nuclear ambitions during peace talks in Islamabad.

While acknowledging that the marathon negotiations in Pakistan had gone "well" and "most points were agreed to," Trump said Tehran had refused to concede on the issue of its nuclear program.

Pakistan's foreign minister insisted on Sunday Washington and Tehran must uphold a ceasefire agreement, after marathon talks between the two sides to end the war in the Middle East ended without an agreement.

Iran's foreign ministry said no one had held any expectation that talks with the United States could have reached an agreement within one session after the negotiations in Islamabad stalled on Sunday.

Iran and the United States failed to reach an agreement to end the war in the Middle East, U.S. Vice President JD Vance said Sunday after marathon talks in Islamabad, adding that he was leaving after giving Tehran the "final and best offer".

Israeli Prime Minister Benjamin Netanyahu said on Saturday that the joint U.S.-Israeli campaign against Iran had succeeded in "crushing" the Islamic republic's nuclear and ballistic missile programs.