US-Iran diplomacy in 2026 centers on implementing and extending the June memorandum of understanding that halted open conflict, reopened the Strait of Hormuz to commercial traffic, waived certain oil sanctions, and launched 60-day talks for a broader accord. Those negotiations produced working groups on nuclear monitoring, sanctions termination, reconstruction funding, and implementation mechanisms but expired without a final deal amid disputes over IAEA inspections, down-blending of enriched uranium stockpiles, sequencing of asset releases, and enforcement of Lebanon-related ceasefires. As of late September, indirect contacts via Qatari mediators continue with positions remaining distant; Washington ties further relief to verifiable nuclear limits while Tehran prioritizes immediate sanctions removal and blockade relief. Regional actors including Pakistan and Gulf states have facilitated deconfliction channels, though renewed threats of force and hardline domestic pressures on both sides constrain progress toward any comprehensive package.