Oil prices slid 1% on Monday with the US and Iran headed for a third round of nuclear talks, easing concerns about a potential conflict, while President Donald Trump created uncertainty for global growth and fuel demand with a new round of tariff hikes. Brent crude futures slid 75 cents, or 1.05%, to $71.01 a barrel by 0055 GMT while US West Texas Intermediate crude futures were at $65.74 a bar