New Delhi, Aug. 18 -- Global crude oil prices stayed above $90 a barrel on Tuesday amid choppy trade, as fading hopes of a deal between the US and Iran kept geopolitical risk elevated.

Brent futures were volatile through the day before edging lower on Tuesday evening. Around 4.55 PM, the October contract of Brent futures on the Intercontinental Exchange was trading at $90.80 per barrel, lower by 0.06% from its previous close. Earlier in the day, it touched $91.74, the highest level since 30 June.

The development comes as Washington and Tehran remain sharply divided on several key issues, including the Strait of Hormuz. The memorandum of understanding (MoU) signed between the US and Iran on 17 June technically expired on Monday, but nego...