Talks between the United States and Iran are back on track after a tense standoff over the agenda and location, following a warning from President Donald Trump to Iran's Supreme Leader. Initial concerns that the negotiations would collapse due to disagreements on including Iran's missile program and regional activities were resolved when both sides agreed to meet in Muscat, Oman, instead of Turkey. The United States insists that any deal must address not only Iran's nuclear ambitions but also its missile program and support for armed groups, while Iran maintains that only its nuclear program is up for discussion. The diplomatic uncertainty has rattled oil markets, with prices surging amid fears of renewed military action, as both sides prepare for high-stakes talks with little optimism for a breakthrough.