The UAE has warned US officials that prolonged dollar shortages from the Iran war could force Abu Dhabi to settle oil sales in Chinese yuan instead—a shift that would threaten the dollar's 50-year dominance in global energy markets. Multiple outlets including Fortune, WSJ reporting, and Middle East Eye confirm Emirati officials raised currency-swap concerns with US Treasury and Federal Reserve, partly triggered by Iranian drone/missile attacks disrupting Gulf exports and depleting dollar reserves. The headline's claim about this being 'the biggest threat since the 1970s' overstates the case—sources describe it as a serious challenge and genuine vulnerability, but not all characterize it as uniquely unprecedented. What's missing: whether the UAE's warning was primarily a liquidity concern or a negotiating tactic to extract formal Federal Reserve swap guarantees (US officials reportedly interpreted it as both), and how much actual dollar shortage versus perceived risk is driving the message.