A woman and a child walk past Iranian-made Zolfaghar missiles displayed at Azadi Square in Tehran on July 24, 2026. Afp | Getty ImagesPresident Donald Trump has warned that the latest round of negotiations with Iran is the "last chance" to bring an end to the five-month conflict. Trump told reporters in the Oval Office late on Monday that talks are "going on right now," at the request of Iran, Saudi Arabia, the United Arab Emirates, Qatar and others.However, Tehran continues to deny that any direct negotiations with the U.S. are taking place — or that there are plans to hold them in the future. Iran's President Masoud Pezeshkian said on Tuesday that Tehran would continue to defend its borders but insisted it does not seek an expansion of the conflict, according to state media reports. "This is a last chance for them to sign a good document," Trump said.In a Truth Social post earlier on Monday, Trump described Iran's leaders as "unbelievably duplicitous" and accused them of lying about peace talks that are underway, "whether Iran wants to admit it or not."Stock Chart IconStock chart iconOil prices ticked higher again on Tuesday amid a lack of clarity over diplomatic efforts. Iranian foreign ministry spokesperson Esmail Baghaei had again poured cold water on the notion of direct negotiations with the United States.Baghaei told a press conference on Monday that there is no immediate plan for negotiations with the U.S., reiterating that Tehran is currently only engaged in talks with Oman regarding the Strait of Hormuz.It came after the president decided to call off "massive attacks" on Iran to allow for talks he said were starting on Monday. The decision lifted market sentiment, with oil prices slumping in response.Oil prices rebounded slightly early on Tuesday as traders became less confident that a diplomatic solution to the conflict, which has upended energy markets, is in sight. West Texas Intermediate futures were up 1.29% at $81.38 per barrel as of 1:35 a.m. ET. Brent crude, the international benchmark, was up 1.73% at $85.23 a barrel. Read more U.S.-Iran war newsTrump insists Iran talks are underway despite Tehran’s ‘duplicitous’ denialsInvestors scored on Iran war’s oil market boom. Staying long the trade will get trickierWhat is Pickaxe Mountain, the Iranian nuclear facility Trump is threatening to strike?Ukraine strikes Iranian vessels in Caspian Sea, Tehran accuses Kyiv of ‘hostile and criminal act’Saudi military strikes Houthi targets in Yemen after Iran-backed militia attacked Red Sea shippingTehran’s Hormuz threat risks global fallout, Rubio warns as U.S. strikes Iran for 11th straight nightIran says it attacked Amazon infrastructure in BahrainU.S. strikes Iran and Houthis threaten Saudi Arabia shipping as mediators push 10-day ceasefireOil exports through the Strait of Hormuz might not return to levels seen before the Iran warStrait of Hormuz shutdown: A visual guide to the world's most critical oil chokepointOil markets are betting on a swift end to the Iran war. Investors may regret itThe Middle East war is testing the Gulf’s ambitions to become an AI hubAnalysis: An end to the Iran war may be just the beginning of a new era of U.S. inequalityWhy the confusion around the Iran situation could get worse. How to profit anywayStrait of Hormuz: Ships attacked as Trump extends Iran ceasefireTrump tells CNBC he expects U.S. to make 'great deal' with IranMore from CNBC Politics U.S. Central Command said on Monday it had redirected 44 commercial vessels as part of its ongoing blockade of the Strait of Hormuz, having disabled two and boarded two. Meanwhile, Iraqi pro-militia outlet Naya late on Monday reported an explosion in Kuwait overnight that could be heard in Basrah Province.