(Bloomberg) -- While Iran and the US make wary diplomatic overtures, a return to their lapsed nuclear agreement remains a distant prospect. But for world oil markets, a pact is already taking effect.Most Read from BloombergNYC’s Most Exciting New Fine Dining Restaurant Is in a Subway StationMore People Call in Sick on August 24 Than Any Other DayTrump Surrenders in Georgia on 2020 Election Probe ChargesNasdaq 100 Drops 2% as Yields Rise Before Powell: Markets WrapModi and Xi Speak at BRICS Summi