Mumbai, Aug. 21 -- Crude oil prices edged lower on Friday morning in Asia but stays around a three-week high amid US-Iran standoff over the Strait of Hormuz. The US and Iran remain unresolved over restoring safe commercial navigation through the strategic Strait of Hormuz, fueling supply concerns and acting as a tailwind for crude oil prices. WTI crude oil futures are trading lower by half a percent at $86.48 per barrel and Brent is holding above $93.50 mark. The WTI counted has gained around 6% so far this week and is set to end higher for the second straight week. Meanwhile, reports suggest President Donald Trump said the US will launch the most crushing economic operation against Iran and threatened severe penalties on any nation that he...