U.S. President Donald Trump said on Friday he expected Tehran to respond “supposedly tonight” to a proposal delivered through Pakistani mediators, but no official Iranian reply had been made public by Saturday evening.Iranian Foreign Minister Abbas Araghchi questioned Washington’s intentions during a phone call with his Turkish counterpart, according to remarks published by Iran’s ISNA news agency.

“The recent escalation of tensions by American forces in the Arabian Gulf and their numerous actions in violating the ceasefire have added to suspicions about the motivation and seriousness of the American side in the path of diplomacy,” Araghchi said.The comments followed a confrontation on Friday in which a U.S. fighter jet fired on and disabled two Iranian-flagged tankers that Washington said had challenged an American naval blockade targeting Iranian ports.

An Iranian military official, quoted by local media, said Iran’s navy had retaliated against what he described as “American terrorism with strikes,” adding that the clashes had since ended.The incident came less than a day after another flare-up in the Strait of Hormuz, one of the world’s most strategically important shipping routes for global oil exports.

U.S. Secretary of State Marco Rubio reiterated Friday that it was “unacceptable” for Tehran to exert control over the waterway, through which a substantial share of global crude shipments passes.The Trump administration has sought to reopen commercial navigation through the strait after Iran restricted maritime access following the outbreak of conflict on Feb. 28, triggered by joint U.S.-Israeli strikes on Iranian targets.

Washington later imposed a blockade on Iranian ports, escalating tensions across Gulf shipping lanes and contributing to volatility in international energy markets.Iranian Foreign Ministry spokesperson Esmaeil Baqaei said Friday the latest U.S. proposal remained “under review.”

Meanwhile, Sheikh Mohammed bin Abdulrahman Al Thani met U.S. Vice President JD Vance in Washington on Friday to discuss Pakistani-mediated efforts to secure a longer-term settlement.Separately, satellite imagery indicated an oil slick spreading near Kharg Island, Iran’s principal oil export hub in the Gulf.

Monitoring group Orbital EOS estimated the slick initially covered more than 20 square miles before appearing to diminish by Saturday.The UK-based Conflict and Environment Observatory said the spill may have originated from damaged or leaking oil infrastructure, though the exact cause remained unclear.

Kharg Island plays a central role in Iran’s energy exports and has become increasingly sensitive amid the ongoing confrontation over Gulf shipping routes and oil flows.