REUTERS/CARLOS BARRIA/KHAMENEI.IR)' title='An illustrative image of US President Donald Trump and Iran's Supreme Leader Ayatollah Ali Khamenei. (photo credit: SHUTTERSTOCK/REUTERS/CARLOS BARRIA/KHAMENEI.IR)' />
With Iran's alliances weakening and US military threats rising, Oman provides a discreet, neutral venue for a possible last bid to resolve the nuclear standoff.