The available evidence supports the broader narrative that oil prices can fall sharply on signs of U.S.-Iran de-escalation or a possible agreement. Reuters' 'Oil settles down over 4% on US-Iran de-escalation, easing supply worries | Reuters' and ING's 'The Commodities Feed: Oil falls below $100 on optimism over Iran war' both align with that causal explanation. However, the exact claim here is narrower: Brent crude fell more than 5% on reports of a possible U.S.-Iran deal. In this run, no fetched authoritative source directly confirmed that precise Brent percentage move on the specific date tied to the user's links. The fetched BlockBeats item is about WTI falling 15%, not Brent, and the Odaily link could not be traced to a primary source. So the statement is plausible and partially supported in substance, but not sufficiently verified in its exact form from the evidence collected.