Despite optimistic statements from US officials, negotiations between Washington and Tehran remain fragile amid deep mistrust and regional tensions. While a temporary framework has kept diplomacy alive, uncertainty over the Strait of Hormuz, Iran's nuclear programme and wider Middle East security continues to threaten prospects for a lasting agreement.

Trump said Tehran had promised no tolls or charges in the strait, hours after Iran and Oman announced a joint permit system asserting their authority over the waterway. Rubio flew…

Despite optimistic statements from US officials, negotiations between Washington and Tehran remain fragile amid deep mistrust and regional tensions. While a temporary framework…