Brent crude, the global benchmark for oil, rose more than 3 percent as trading resumed on Sunday, while S&P 500 futures remained essentially unchanged.

The Qatari-donated plane has been under scrutiny over whether it is fitted with sufficient defensive capabilities to adequately protect a U.S. president and others traveling on it.

U.S. and Iranian attacks are unfolding in a way that risks a wider war they cannot contain, analysts warn, unless they can return to negotiations quickly.