Oil markets experienced their most dramatic single-day collapse since the early pandemic on Tuesday, with crude prices plummeting as much as 15% after the United States and Iran announced a conditional ceasefire plan.

The sharp reversal — which sent Brent crude below $85 per barrel at one point during trading — came as welcome relief to global markets that had been bracing for prolonged conflict in the Middle East. Stock indices surged in response, with the S&P 500 climbing 2.3% and European markets posting similar gains.

According to BBC News, the ceasefire remains conditional and details of the agreement have not been fully disclosed. The announcement follows weeks of escalating tensions that had pushed oil prices to their highest levels in over a year, threatening to reignite inflation just as central banks appeared to be gaining the upper hand.

Despite Tuesday's dramatic selloff, crude prices remain roughly 30% higher than they were before the conflict began. That persistent elevation reflects ongoing concerns about supply disruptions and the fragility of any diplomatic agreement between Washington and Tehran.

Energy analysts cautioned against reading too much into a single day's price action. "Markets are breathing a sigh of relief, but we're still walking on a tightrope," said commodity strategist Maria Gonzalez at Aberdeen Asset Management. "Any breakdown in this ceasefire could send prices right back up."

The oil price collapse delivered immediate benefits to consumers and businesses facing elevated fuel costs. Gasoline futures dropped 12% in sympathy trading, suggesting pump prices could fall within days if the ceasefire holds.

For policymakers at the Federal Reserve and European Central Bank, the news offers a potential reprieve from the difficult calculus of fighting inflation while supporting growth. Energy price shocks had threatened to derail carefully calibrated monetary policy just as inflation appeared to be moderating toward target levels.