US stock market today: S&P 500, Nasdaq futures slip as US-Iran talks ease oil prices

US stock futures slipped on 22 June as investors monitored progress in US-Iran peace talks, with S&P 500 futures down 0.2 percent and Dow Jones futures shedding 29 points. Crude oil prices fell sharply, with Brent down 2 percent to around 79 dollars a barrel and WTI slipping to 74.62 dollars, on easing Middle East supply concerns after reports of a 60-day peace roadmap. Traders adopted a wait-and-watch stance ahead of Thursday's PCE inflation report, the Federal Reserve's preferred inflation gauge.