Vance touted resumed oil flows and falling gas prices but a planned Friday ceremony in Switzerland was called off, clouding the path to a final nuclear deal.

Analysts and officials across the political spectrum condemned the 14-point memorandum signed at Versailles, saying it leaves Iran's nuclear and missile programs unaddressed.

Brent crude slid to a war-era low Thursday after Saudi supertankers transited the strait following the signed U.S.-Iran ceasefire deal.

The 14-point memorandum halts fighting, reopens the Strait of Hormuz, and lifts oil sanctions while deferring nuclear and reconstruction details to negotiations.