Asian share markets were broadly flat and oil prices eased as investors awaited details of threatened U.S. sanctions on Iran. Markets were also focused on Nvidia’s results on Wednesday, with analysts expecting quarterly revenue to nearly double to around $92 billion and full-year earnings guidance in a range of $103 billion to $105 billion. Investors will look for clues on U.S. interest rates when Federal Reserve Chairman Kevin Warsh speaks in Jackson Hole, Wyoming, on Friday, although JPMorgan chief economist Bruce Kasman said the event could disappoint markets because Federal Reserve chairs have generally avoided previewing policy decisions there. Markets imply about a 40% chance of a rate increase at the Fed’s September 16 meeting and fully price a move by December, while core inflation is forecast to remain at 3.3% in July. Treasury Secretary Scott Bessent’s plan to at least double bond buybacks has so far done little to contain 30-year Treasury yields, which rose back to 5.2760%, near a recent 19-year high of 5.3371%. Brent crude fell 1.0% to $93.43 a barrel and U.S. crude eased 1.1% to $86.14. The Canadian dollar weakened after Prime Minister Mark Carney said Canada would retaliate against U.S. tariffs. Gold rose 0.4% to $4,623 an ounce and was up more than 14% for August, which would be its biggest monthly gain on record if sustained.